artificial selection

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Artificial Selection: 

Artificial Selection Look at the difference between these species of dog below:

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Wild dogs Terriers Collies Viemerana

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What were the differences between the dogs? Size Colour Muscle development Length of coat Job Nature

Where have all these different species come from?: 

Where have all these different species come from? All these species are related to the wolf. But how?

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Over thousands of years man has selected characteristics in dogs that are useful….. Very small dogs Used for pets Large hunting dogs Strong & powerful Large working dogs Strong and athletic

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Artificial selection is the gradual improvement of animal and plant characteristics over time, for man’s benefit.

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This artificial selection of characteristics happens in plants as well.. In the wild there are various species of corn plant

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Good point: Strong stem Bad point: Small head Good point: Huge head of grain Bad point: Drought sensitive 1 2 3 4 Bad point: Small root Good point: strong roots Bad point: Small plant Good point: Disease resistant

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Good point: Strong stem Good point: Huge head of grain Super CORN! Good point: Strong roots Good point: Disease resistant

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Look what has happened to the varieties of the corn over last few hundred years.

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Look at the variety of plants that have been artificially selected from mustard!

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Growing lots of different varieties of wheat………… ……looking for new characteristics.

Things I must know about artificial selection: 

Things I must know about artificial selection A.S. is the gradual improvement of organisms characteristics – for humans benefit. A.S. takes hundreds of years We have A.S. lots of animals and plants A.S. animals & plants produced higher yields: 1. more milk 2. more meat 3. more fruit