Meiosis Tutorial

Views:
 
Category: Entertainment
     
 

Presentation Description

No description available.

Comments

Presentation Transcript

Press the F5 button on your keyboard to start the tutorial:

Press the F5 button on your keyboard to start the tutorial

Meiosis Tutorial:

Meiosis Tutorial Interphase Prophase Metaphase Anaphase Telophase Mitosis Quiz Place your keyboard aside. Use your mouse to navigate. Now for Meiosis Germ cells Interphase Prophase 1 Tetrads Crossing Over Metaphase 1 Anaphase 1 Telophase 1 Prophase 2 Metaphase 2 Anaphase 2 Telophase 2 Meiosis Quiz Get Started

Mitosis Review:

Mitosis Review All cells will eventually get old and die. Therefore, cells must divide in order to replace old and dying cells . Go Back Home

Mitosis Review:

Mitosis Review All cells will eventually get old and die. Therefore, cells must divide in order to replace old and dying cells . Mitosis  is the process of how diploid cells divide. Diploid cells are cells with the complete set of chromosomes for that species. Go Back Home

Mitosis Review:

Mitosis Review All cells will eventually get old and die. Therefore, cells must divide in order to replace old and dying cells . Mitosis  is the process of how diploid cells divide. Diploid cells are cells with the complete set of chromosomes for that species. For example, humans have a complete set of 46 chromosomes in diploid cells. Go Back Home

Mitosis Review:

Mitosis Review All cells will eventually get old and die. Therefore, cells must divide in order to replace old and dying cells . Mitosis  is the process of how diploid cells divide. Diploid cells are cells with the complete set of chromosomes for that species. For example, humans have a complete set of 46 chromosomes in diploid cells. In diploid cells, chromosomes are always arranged in pairs. For example, the 46 human chromosomes are arranged in 23 pairs. In the karyotype, you can see a diploid human cell with 46 chromosomes, or 23 pairs of chromosomes. Go Back Home

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. Interphase Go Back Home

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. Interphase Go Back Home This blueprint holds the instructions to build a boat.

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. Interphase Go Back Home DNA holds the instructions to make a protein.

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. The proteins made during interphase, help red blood cells carry oxygen. Interphase Go Back Home Vein RBC RBC

Interphase:

Interphase Go Back Home Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. The proteins made during interphase, help red blood cells carry oxygen. The proteins made during interphase, help nerve cells send message to and from the brain.

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. The proteins made during interphase, help red blood cells carry oxygen. The proteins made during interphase, help nerve cells send message to and from the brain. The proteins made during interphase, help stomach cells secrete enzymes to digest your food. Interphase Go Back Home

Interphase:

Cells perform their necessary functions during INTERPHASE of the cell cycle. During interphase, the cell’s DNA is being used as a blueprint to make proteins. The proteins made during interphase, help red blood cells carry oxygen. The proteins made during interphase, help nerve cells send message to and from the brain. The proteins made during interphase, help stomach cells secrete enzymes to digest your food. In order for your cells to make these needed proteins, the DNA must be in a loose form called chromatin. Interphase Go Back Home DNA as loose chromatin.

Interphase:

In this animation, the cell contains 4 strands of chromatin. Interphase Go Back Home

Interphase:

In this animation, the cell contains 4 strands of chromatin. Interphase Go Back Home two chromatin strands in black… two chromatin strands in red…

Interphase:

In this animation, the cell contains 4 strands of chromatin. During the S stage of interphase, the chromatin will duplicate, doubling the amount of DNA strands. Interphase Go Back Home two chromatin strands in black… two chromatin strands in red…

Interphase:

In this animation, the cell contains 4 strands of chromatin. During the S stage of interphase, the chromatin will duplicate, doubling the amount of DNA strands. Interphase Go Back Home Now there are 8 total strands of chromatin.

Prophase of Mitosis:

Prophase marks the start of mitosis. Prophase of Mitosis Go Back Home

Prophase of Mitosis:

Prophase marks the start of mitosis. During mitosis, cells will stop performing their normal functions and will focus on division. Stomach cells stop secreting digestive enzymes as they go through the mitosis. Prophase of Mitosis Go Back Home

Prophase of Mitosis:

Prophase marks the start of mitosis. During mitosis, cells will stop performing their normal functions and will focus on division. Stomach cells stop secreting digestive enzymes as they go through the mitosis. The reason the cell stops performing its function is because the cell will package it’s DNA for transport. The loose chromatin that exists at the start of prophase, will condense into easily moveable, compact structures called chromosomes. Prophase of Mitosis Go Back Home

Prophase of Mitosis:

Prophase marks the start of mitosis. During mitosis, cells will stop performing their normal functions and will focus on division. Stomach cells stop secreting digestive enzymes as they go through the mitosis. The reason the cell stops performing its function is because the cell will package it’s DNA for transport. The loose chromatin that exists at the start of prophase, will condense into easily moveable, compact structures called chromosomes. Prophase of Mitosis Go Back Home The 8 strands of chromatin condense into 4 chromosomes.

Prophase of Mitosis:

Prophase marks the start of mitosis. During mitosis, cells will stop performing their normal functions and will focus on division. Stomach cells stop secreting digestive enzymes as they go through the mitosis. The reason the cell stops performing its function is because the cell will package it’s DNA for transport. The loose chromatin that exists at the start of prophase, will condense into easily moveable, compact structures called chromosomes. During prophase, the nucleus dissolves and spindle fibers form. Prophase of Mitosis Go Back Home

Prophase of Mitosis:

Prophase marks the start of mitosis. During mitosis, cells will stop performing their normal functions and will focus on division. Stomach cells stop secreting digestive enzymes as they go through the mitosis. The reason the cell stops performing its function is because the cell will package it’s DNA for transport. The loose chromatin that exists at the start of prophase, will condense into easily moveable, compact structures called chromosomes. During prophase, the nucleus dissolves and spindle fibers form. Prophase of Mitosis Go Back Home Nucleus dissolves

Metaphase of Mitosis:

During metaphase, the spindle fibers will connect to the centromere location of every chromosome. Metaphase of Mitosis Go Back Home

Metaphase of Mitosis:

During metaphase, the spindle fibers will connect to the centromere location of every chromosome. Then, the spindle fibers will pull the chromosomes to the equator of the cell. Metaphase of Mitosis Go Back Home

Metaphase of Mitosis:

During metaphase, the spindle fibers will connect to the centromere location of every chromosome. Then, the spindle fibers will pull the chromosomes to the equator of the cell. Metaphase of Mitosis Go Back Home Chromosomes are pulled to the equator

Anaphase of Mitosis:

Remember that every chromosome is made from two halves called chromatids. Ana phase of Mitosis Go Back Home

Anaphase of Mitosis:

Remember that every chromosome is made from two halves called chromatids. Now that the chromosomes are aligned along the equator, the spindle fibers will pull apart the chromatids of every chromosome. Ana phase of Mitosis Go Back Home

Anaphase of Mitosis:

Remember that every chromosome is made from two halves called chromatids. Now that the chromosomes are aligned along the equator, the spindle fibers will pull apart the chromatids of every chromosome. Ana phase of Mitosis Go Back Home Chromatids pulled to opposite ends of the cell.

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Telo phase of Mitosis Go Back Home

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Telo phase of Mitosis Go Back Home The cytoplasm divides during cytokinesis. This will split the cell in half.

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Telo phase of Mitosis Go Back Home The chromatids unwind into loose strands of chromatin.

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Telo phase of Mitosis Go Back Home The nucleus regrows in both cells.

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Now that mitosis is finished, the one diploid cell has divided into two diploid cells. Telo phase of Mitosis Go Back Home

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Now that mitosis is finished, the one diploid cell has divided into two diploid cells. Somatic, or non-sex cells, are examples of cells that divide by mitosis. Telo phase of Mitosis Go Back Home

Telophase of Mitosis:

Now that the chromatids are moved to opposite ends of the cell, the following events happen: Now that mitosis is finished, the one diploid cell has divided into two diploid cells. Somatic, or non-sex cells, are examples of cells that divide by mitosis. Muscle cells, Nerve cells, Stomach cells, Skin cells, Blood cells, are all examples of somatic and diploid cells. The only cells that are not created by mitosis are sperm and egg cells. Sperm and egg divide by meiosis. Telo phase of Mitosis Go Back Home

Mitosis Quiz:

Mitosis Quiz Home Go Back 1 ) Here is a picture of interphase. Which choice happens during interphase? DNA is copied Chromatin condenses into chromosomes Cytokinesis splits the cytoplasm Nucleus dissolves Chromosomes align at equator Correct. No. This is prophase. No. This is telophase. No. This is metaphase No. This is prophase.

Mitosis Quiz:

Mitosis Quiz Home Go Back 2 ) Which stage of the cell cycle is this? Interphase Prophase Metaphase Anaphase Telophase Correct. No No No No

Mitosis Quiz:

Mitosis Quiz Home Go Back 3 ) This is a picture or prophase. Which choice happens during prophase? DNA is copied Chromatin condenses into chromosomes Cytokinesis splits the cytoplasm Chromatids pulled to ends of cell Chromosomes align at equator Correct. No. This is anaphase. No. This is telophase. No. This is metaphase No. This is interphase.

Mitosis Quiz:

Mitosis Quiz Home Go Back 4 ) Which stage of the cell cycle is this? Interphase Prophase Metaphase Anaphase Telophase Correct. No No No No

Mitosis Quiz:

Mitosis Quiz Home Go Back 5 ) Here is a picture of telophase. Which choice does NOT happen in telophase? Nucleus regrows Cytokinesis divides the cytoplasm Chromatids unwind into chromatin Chromosomes align at equator. Correct. This happens in metaphase. No No No

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. 1 2 _

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes.

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. Paired chromosomes = diploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. Paired chromosomes = diploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. Paired chromosomes = diploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. Paired chromosomes = diploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes.

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Single chromosome = haploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Single chromosome = haploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Single chromosome = haploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Single chromosome = haploid

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Examples of haploid cells are the gametes. Gametes are sex cells such as sperm cells in males. And egg cells, or ovum, in females.

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Examples of haploid cells are the gametes. Gametes are sex cells such as sperm cells in males. And egg cells, or ovum, in females. Sperm is the male gamete

Now for Meiosis:

Now for Meiosis Go Back Home So now lets focus on Meiosis. Meiosis is the process for making haploid cells. Haploid cells are cells that contain only half the number of chromosomes for that species. For example, human diploid cells contain 46 chromosomes. But human haploid cells contain only 23 chromosomes. Examples of haploid cells are the gametes. Gametes are sex cells such as sperm cells in males. And egg cells, or ovum, in females. The ovum (egg) is the female gamete Sperm is the male gamete

Germ Cells:

Germ Cells Go Back Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses.

Germ Cells:

Germ Cells Go Back Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. Ebola virus

Germ Cells:

Germ Cells Go Back Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. The bacteria that caused the Bubonic Plague

Germ Cells:

Germ Cells Go Back Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. In this case, germ cells are the diploid cells that go through meiosis.

Germ Cells:

Germ Cells Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. In this case, germ cells are the diploid cells that go through meiosis. Males have germ cells in their testes. The male germ cells will go through meiosis to make sperm cells. Go Back

Germ Cells:

Germ Cells Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. In this case, germ cells are the diploid cells that go through meiosis. Males have germ cells in their testes. The male germ cells will go through meiosis to make sperm cells. Females have germ cells in their ovaries. The female germ cells will go through meiosis to make egg cells. Go Back

Germ Cells:

Germ Cells Home Germ cells are not what you think they are. When we think germs, we think bacteria and viruses. In this case, germ cells are the diploid cells that go through meiosis. Males have germ cells in their testes. The male germ cells will go through meiosis to make sperm cells. Females have germ cells in their ovaries. The female germ cells will go through meiosis to make egg cells. Lets discuss interphase, which happens before meiosis. Go Back

Interphase:

In this animation, the cell contains 4 strands of chromatin. Interphase Go Back Home

Interphase:

In this animation, the cell contains 4 strands of chromatin. Interphase Go Back Home two chromatin strands in black… two chromatin strands in red…

Interphase:

In this animation, the cell contains 4 strands of chromatin. During the S stage of interphase, the chromatin will duplicate, doubling the amount of DNA strands. Interphase Go Back Home two chromatin strands in black… two chromatin strands in red…

Interphase:

In this animation, the cell contains 4 strands of chromatin. During the S stage of interphase, the chromatin will duplicate, doubling the amount of DNA strands. Interphase Go Back Home Now there are 8 total strands of chromatin.

Interphase:

In this animation, the cell contains 4 strands of chromatin. During the S stage of interphase, the chromatin will duplicate, doubling the amount of DNA strands. In case you didn’t notice… There’s really no difference between interphase prior to mitosis and interphase prior to meiosis. Interphase Go Back Home

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Prophase 1 of Meiosis Go Back Home

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Prophase 1 of Meiosis Go Back Home

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Prophase 1 of Meiosis Go Back Home The nucleus dissolves

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Just like in prophase of mitosis, the chromatin will condense into compact structures called chromosomes. Prophase 1 of Meiosis Go Back Home

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Just like in prophase of mitosis, the chromatin will condense into compact structures called chromosomes. Prophase 1 of Meiosis Go Back Home 8 strands of chromatin condense into 4 chromosomes Mom 1 Dad 2 Mom 2 Dad 1

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Just like in prophase of mitosis, the chromatin will condense into compact structures called chromosomes. Here is where meiosis and mitosis start to differ. An event called synapsis happens next. Prophase 1 of Meiosis Go Back Home Mom 1 Dad 2 Mom 2 Dad 1

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Just like in prophase of mitosis, the chromatin will condense into compact structures called chromosomes. Here is where meiosis and mitosis start to differ. An event called synapsis happens next. During synapsis, the two chromosome number 1’s are pulled next to each other. The same thing happens with the chromosome number 2’s. Prophase 1 of Meiosis Go Back Home Mom 1 Dad 2 Mom 2 Dad 1

Prophase 1 of Meiosis:

Prophase 1 marks the start of meiosis. Just like in prophase of mitosis, the nucleus will dissolve… Just like in prophase of mitosis, the chromatin will condense into compact structures called chromosomes. Here is where meiosis and mitosis start to differ. An event called synapsis happens next. During synapsis, the two chromosome number 1’s are pulled next to each other. The same thing happens with the chromosome number 2’s. Prophase 1 of Meiosis Go Back Home Synapsis Mom 1 Dad 2 Mom 2 Dad 1

Tetrads:

Now that both chromosome 1’s have been paired… Tetrads Go Back Home Mom 1 Dad 2 Mom 2 Dad 1

Tetrads:

Now that both chromosome 1’s have been paired… Now that both chromosome 2’s have been paired… Tetrads Go Back Home Mom 1 Dad 2 Mom 2 Dad 1

Tetrads:

Now that both chromosome 1’s have been paired… Now that both chromosome 2’s have been paired… These grouping of chromosomes are called a tetrad. Tetrads Go Back Home Mom 1 Dad 2 Mom 2 Dad 1 tetrad tetrad

Tetrads:

Now that both chromosome 1’s have been paired… Now that both chromosome 2’s have been paired… These grouping of chromosomes are called a tetrad. Tetra is a prefix that means “4”. Notice how every tetrad is made from 2 chromosomes. But since every chromosome is made from 2 chromatids, there are 4 chromatids in every tetrad. Tetrads Go Back Home Mom 1 Dad 2 Mom 2 Dad 1 tetrad tetrad

Tetrads:

Now that both chromosome 1’s have been paired… Now that both chromosome 2’s have been paired… These grouping of chromosomes are called a tetrad. Tetra is a prefix that means “4”. Notice how every tetrad is made from 2 chromosomes. But since every chromosome is made from 2 chromatids, there are 4 chromatids in every tetrad. Why does synapsis happen? This happens because it sets up the next event called crossing over. Tetrads Go Back Home Mom 1 Dad 2 Mom 2 Dad 1 tetrad tetrad

Crossing Over:

Lets zoom into one of the tetrads. Crossing Over Go Back Home Dad 2 Mom 2 tetrad tetrad Mom 1 Dad 1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Lets zoom back out to the entire cell. Crossing Over Go Back Home Mom #1 Dad #1

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Lets zoom back out to the entire cell. Crossing over will happen in the other tetrad as well. Crossing Over Go Back Home Dad 2 Mom 2

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Lets zoom back out to the entire cell. Crossing over will happen in the other tetrad as well. Crossing Over Go Back Home Dad 2 Mom 2

Crossing Over:

Lets zoom into one of the tetrads. During crossing over, enzymes will break off a small portion of chromosome #1 that you inherited from your mother… Enzymes will break off a small portion of chromosome #1 that you inherited from your father… Next, the broken chromosome fragments will attach to the opposite chromosome. Lets zoom back out to the entire cell. Crossing over will happen in the other tetrad as well. Crossing Over Go Back Home Crossing over is important because it recombines DNA into new traits. This creates genetic diversity.

Metaphase 1 of Meiosis:

During metaphase 1, spindle fibers will pull the tetrads to the equator of the cell. Metaphase 1 of Meiosis Go Back Home

Metaphase 1 of Meiosis:

During metaphase 1, spindle fibers will pull the tetrads to the equator of the cell. Metaphase 1 of Meiosis Go Back Home Tetrads pulled to equator.

Anaphase 1 of Meiosis:

During anaphase 1, spindle fibers will pull the tetrads apart. Anaphase 1 of Meiosis Go Back Home

Anaphase 1 of Meiosis:

During anaphase 1, spindle fibers will pull the tetrads apart. One chromosome of a tetrad is pulled to the left… one chromosome of a tetrad is pulled to the right. Anaphase 1 of Meiosis Go Back Home

Anaphase 1 of Meiosis:

During anaphase 1, spindle fibers will pull the tetrads apart. One chromosome of a tetrad is pulled to the left… one chromosome of a tetrad is pulled to the right. Anaphase 1 of Meiosis Go Back Home Tetrads pulled apart

Telophase 1 of Meiosis:

During telophase 1, the nucleus will often regrow. Telophase 1 of Meiosis Go Back Home

Telophase 1 of Meiosis:

During telophase 1, the nucleus will often regrow. Telophase 1 of Meiosis Go Back Home Two nuclei regrow

Telophase 1 of Meiosis:

During telophase 1, the nucleus will often regrow. Cytokinesis will divide the cytoplasm into two separate cells. Telophase 1 of Meiosis Go Back Home

Telophase 1 of Meiosis:

During telophase 1, the nucleus will often regrow. Cytokinesis will divide the cytoplasm into two separate cells. Telophase 1 of Meiosis Go Back Home Cytokinesis splits the cell in two

Telophase 1 of Meiosis:

During telophase 1, the nucleus will often regrow. Cytokinesis will divide the cytoplasm into two separate cells. This will complete the first half of meiosis. However, the germ cells that undergo meiosis will divide once more. Telophase 1 of Meiosis Go Back Home

Prophase 2 of Meiosis:

The purpose of meiosis is to reduce the amount of DNA in the gametes by half. That is why another round of division is needed. Prophase 2 of Meiosis Go Back Home

Prophase 2 of Meiosis:

The purpose of meiosis is to reduce the amount of DNA in the gametes by half. That is why another round of division is needed. During prophase 2, the following events happen: Prophase 2 of Meiosis Go Back Home

Prophase 2 of Meiosis:

The purpose of meiosis is to reduce the amount of DNA in the gametes by half. That is why another round of division is needed. During prophase 2, the following events happen: Prophase 2 of Meiosis Go Back Home Spindle fibers are formed and the nuclei dissolve again.

Metaphase 2 of Meiosis:

During metaphase 2, spindle fibers will pull the chromosomes to the equator of both cells. Metaphase 2 of Meiosis Go Back Home

Metaphase 2 of Meiosis:

During metaphase 2, spindle fibers will pull the chromosomes to the equator of both cells. Metaphase 2 of Meiosis Go Back Home Spindle fibers pull the chromosomes to equator

Anaphase 2 of Meiosis:

Remember that every chromosome is made from 2 chromatids. Anaphase 2 of Meiosis Go Back Home

Anaphase 2 of Meiosis:

Remember that every chromosome is made from 2 chromatids. During anaphase 2, spindle fibers will pull apart the chromosomes. Anaphase 2 of Meiosis Go Back Home

Anaphase 2 of Meiosis:

Remember that every chromosome is made from 2 chromatids. During anaphase 2, spindle fibers will pull apart the chromosomes. One chromatid will be pulled to each end of the cell. Anaphase 2 of Meiosis Go Back Home

Anaphase 2 of Meiosis:

Remember that every chromosome is made from 2 chromatids. During anaphase 2, spindle fibers will pull apart the chromosomes. One chromatid will be pulled to each end of the cell. Anaphase 2 of Meiosis Go Back Home Chromatids pulled to opposite ends of the cell

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Telophase 2 of Meiosis Go Back Home

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. Telophase 2 of Meiosis Go Back Home

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. Telophase 2 of Meiosis Go Back Home The cytoplasm divides

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. Telophase 2 of Meiosis Go Back Home

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. Telophase 2 of Meiosis Go Back Home Four nuclei regrow

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. Telophase 2 of Meiosis Go Back Home

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. Telophase 2 of Meiosis Go Back Home Chromatids uncurl into chromatin

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. When finished, notice… Telophase 2 of Meiosis Go Back Home

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. When finished, notice… Telophase 2 of Meiosis Go Back Home 1 2 4 3 Four cells have been created.

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. When finished, notice… Telophase 2 of Meiosis Go Back Home Four cells have been created. The cells are haploid. The cells started with 4 strands of chromatin, but now they only have 2 strands. 1 1 1 1 2 2 2 2

Telophase 2 of Meiosis:

During telophase 2, the following events will happen: Cytokinesis will split the 2 cells into 4 cells. The nucleus will regrow in all 4 cells. The chromatids will unwind into loose strands of chromatin. When finished, notice… Telophase 2 of Meiosis Go Back Home Four cells have been created. The cells are haploid. The cells started with 4 strands of chromatin, but now they only have 2 strands. Because of crossing over, each cell is unique. It has a different mix of red and black chromatin.

Meiosis Review Quiz:

Meiosis Review Quiz In which event are chromosomes paired with one another? Go Back Home Dad #1 Mom #1 Crossing Over Synapsis Mitosis Nope Nope Correct

Meiosis Review Quiz:

Meiosis Review Quiz The loose, linear strands of DNA are known as _____________. Go Back Home Chromosomes Chromatids Chromatin Correct Nope Nope

Meiosis Review Quiz:

Meiosis Review Quiz Which statement about meiosis is FALSE? Go Back Home Meiosis makes diploid cells. Meiosis creates gametes. Meiosis makes 4 cells at a time. This is a true statement. Correct This is a true statement.

Meiosis Review Quiz:

Meiosis Review Quiz During which event will chunks of one chromosome break away and connect to another chromosome? Go Back Home Synapsis Cytokinesis Crossing Over Correct. Nope. Nope.

Meiosis Review Quiz:

Meiosis Review Quiz Which cell would be created by meiosis? Go Back Home Skin cell Ovum cell Muscle cell Nope. Nope. Correct. The ovum is the egg cell. Brain cell Nope.

Meiosis Review Quiz:

Meiosis Review Quiz When does synapsis and crossing over happen during meiosis? Go Back Home Metaphase 2 Interphase Telophase 1 Nope. Nope. Nope. Prophase 1 Correct.

Meiosis Review Quiz:

Meiosis Review Quiz In relation to meiosis, what are germ cells? Go Back Home Cells that cause disease Cells that start and end haploid Cells that undergo meiosis Correct Nope. Nope. Cells that grow into a baby Nope.

Finished:

Finished Check over your worksheet for any accidental blanks. Turn in your worksheet when finished. Go Back Home

authorStream Live Help