SPECIATION – Questions & Answers

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SPECIATION – Questions & Answers Biology Grade 10 Science

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SPECIATION – Questions & Answers:

SPECIATION – Questions & Answers Charmi Doshi X - A

Define speciation.:

Define speciation. Origin of a new species from the existing one is called speciation.

What factors could lead to the rise of a new Species (speciation)?:

What factors could lead to the rise of a new Species (speciation)? Geographical isolation. Action of environmental factors on the isolated populations. Reproductive isolation for a long time. Genetic drift and natural selection.

Will geographical isolation be a major factor in the speciation of a self pollinating plant species? Why or why not?:

Will geographical isolation be a major factor in the speciation of a self pollinating plant species? Why or why not? No. This is because in cross pollinated species, when geographically isolated there will be more accumulation of variations. But in self pollinated species geographical isolation will not be a major factor for speciation because new genes do not enter the population.

Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually?:

Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? No, in asexually reproducing organisms there is very little variation over generations. Asexual reproduction does not require two organisms to reproduce as variations in the DNA are not enough to raise a new species. Thus geographical isolation is not a major factor.

What is genetic drift?:

What is genetic drift? Genetic Drift is the sudden random change in the frequency of genes in a small population over successive generations .