Why are bananas curved and why are my grapes black and why is my food all multicolored
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Answer:
Genetic variation is the raw material of evolution. Without genetic variation, a population cannot evolve in response to changing environmental variables and, as a result, may face an increased risk of extinction. For example, if a population is exposed to a new disease, selection will act on genes for resistance to the disease if they exist in the population. But if they do not exist — if the right genetic variation is not present — the population will not evolve and could be wiped out by the disease.
As an endangered species dwindles, it loses genetic variation — and even if the species rebounds, its level of genetic variation will not. Genetic variation will only slowly be restored through the accumulation of mutations over many generations. For this reason, an endangered species with low genetic variation may risk extinction long after its population size has recovered.
Answer:
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