All populations tend to overproduce offspring. Use this fact asa starting point to explain how natural selection can lead to theevolution of adaptations in a population.

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Bunny GreenfelderLv2

28 Sep 2019

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Sickle cell anemia: The selective forces that a populationexperiences can vary by context, especially by geographicplace.

a) Explain in your own words how natural selection affects theevolution of hemoglobin in humans and how and why the selectivepressures differ among human populations.

b) For your answer to part a, which are examples of disruptive,stabilizing or directional selection?

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goldlion697

1. 1. Explain how Darwin used Malthusâ observation about populations to construct his hypothesis on natural selection. More offspring than the environment can support, fitness, variation, selection pressures, population definition (some ideas to help formulate the answer).

2. Define what a gene pool is, what major events can alter the frequency of said pool and what this leads to. Think about describing processes like gene flow, genetic drift, and natural selection.

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?

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All populations tend to overproduce offspring. Use this fact asa starting point to explain how natural selection can lead to theevolution of adaptations in a population.

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