Evolutionary processes Chapter 25 Flashcards Preview

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Flashcards in Evolutionary processes Chapter 25 Deck (16):
1

Describe the four processes that can change allele frequencies in populations.

 

2

Use the Hardy-Weinberg principle to test whether evolution or non-random mating is occurring at a particular gene.

3

Discuss the four types of natural selection.

4

Discuss the influence of genetic drift.

5

Predict the results of inbreeding and non-random (assortative) mating on a population.

6

Discuss the influence of sexual selection on the evolution of traits.

7

In general terms describe how natural selection, genetic drift, gene flow, and mutations alter allele frequencies in populations (Freeman p 477).

8

What is the gene pool imagined by Hardy and Weinberg?

9

If just two alleles of a particular gene exist in a population (A1 and A2), their frequencies  are given by p and q.  Provide the three genotypes that are possible, and the mathematical formula that represents the genotype frequencies.

10

Given a parental generation allele frequency of A1: p = 0.6 and  A2: q = 0.4, use a Punnett square to calculate the genotype frequencies and allele frequencies in the offspring generation in a population where no evolution is occurring with respect to gene A.

11

List the five assumptions that must be met for a population to conform to the Hardy-Weinberg principle.

12

How does the Hardy-Weinberg principle serve as a null hypothesis?

13

With reference to Case Study 1 (Freeman p 480), is the human population presently undergoing evolution with respect to the MN blood type gene?  Why or why not?

14

With reference to Case Study 2 (Freeman p 481), is the Havasupai human population in Arizona presently undergoing evolution with respect to the HLA-A and HLA-B genes?  Why or why not?

15

Differentiate between the four types of natural selection: directional selection, stabilizing selection, disruptive selection, and balancing selection.

16