Explain how the theory of Natural Selection involves genetic variation and adaptation ? and bring reference!!!!!!!

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Elin HesselLv2

13 Oct 2018

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1. Define allele and how it relates to genetic variation and how both relates to natural selection.

2. Define adaptation and how it relates to natural selection.

Someevolutionary biologists have argued that the neutral theory shouldbe taken as the nullhypothesis to explain genetic variation within species orpopulations and genetic differences among them. In this view,adaptation and natural selection should be the preferredexplanation only if genetic drift cannot explain the data. Othersmight argue that since there is so much evidence that naturalselection has shaped species

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Describe three different population genetic scenarios under which natural selection is not expected to achieve perfect adaptation. (2) Give an example of one scenario. (1) For that example, explain which population genetic mechanisms are operating (1) and how they interact to result in imperfect adaptation. (1)