briefly explain the three conditions required for natural selection to operate

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Jamar FerryLv2

29 Mar 2019

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which of the following statements about natural selection is true?

Briefly explain the phenomenon of natural selection.

crimsonchinchilla487

1 Explain at least 3 ways that selection can preserve genetic variation.

2 Explain how selection affects differently: dominant vs recessive traits; homozygotes vs heterozygotes; and when frequency-dependence is a factor.

3 What is the source of genetic variation? How does meiosis contribute to maintenance of genetic diversity?

4Describe the preconditions for natural selection to operate and what the results of natural selection will be.

5 Use the HW equations to solve simple population genetics problems with and without selection.

6 Hardy-Weinberg equilibrium tells us the conditions under which populations will not evolve. So what types of things may lead to a population evolving? How do these things lead to populations evolving (gene frequencies changing)?

7 When is genetic drift the strongest?

Huntington disease is a brain disorder that causes severe cognitive and physical problems. Is natural selection acting to bring about evolutionary change in this trait in the Canadian population? In your answer, address the two conditions that are necessary and sufficient for natural selection to bring about evolutionary change in a population and explain whether these conditions are met for this trait.