FREE BIOLOGY AND STUDY GAMES ABOUT BIOL CHAPTER

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FREE BIOLOGY AND STUDY GAMES ABOUT BIOL CHAPTER

20 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -55 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: Genetic variation in a population results from evolutionary forces that cause changes in ____.

Answer:

allele frequencies

Question 2: For a population to be in Hardy-Weinberg equilibrium, _____.

Answer:

there must be no migration into or out of the population

Question 3: What is the founder effect?

Answer:

Changes in allele frequencies that result from the colonization of a new location by a small group of individuals from a larger population Question 4: Which type of selection acts to eliminate individuals which are intermediate on a phenotypic range?

Answer:

Disruptive selection

Question 5: ______ is the ultimate source of genetic variation.

Answer:

mutation Question 6: Which of the following best describes the genetic variation of a population?

Answer:

Genetic variation refers to the fact that different individuals of a population have different alleles of genes.Question 7: Self-fertilization in plants is an example of what evolutionary process?

Answer:

Nonrandom mating Question 8: The type of nonrandom mating in which phenotypically similar individuals mate is called

Answer:

assortative Question 9: Which of the following is true of evolutionary forces in natural populations?

Answer:

Evolutionary forces can alter allele frequencies in natural populations.

Question 10: Which of the following is an example of stabilizing selection?

Answer:

Newborn babies of intermediate weight are most likely to survive; both high and low birthweights are associated with increased infant mortality.Question 11: _____ selection is a type of natural selection in which competition for mates drives the evolution of certain traits.

Answer:

intrasexual Question 12: _______ selection is a form of sexual selection based on same-sex competition usually involving males, in which the winner "gains" a mating partner.

Answer:

intrasexual

Question 13: Which of the following is a driving force of intersexual selection?

Answer:

Female choice of males based on certain characteristics Question 14: _______ selection favors individuals at one extreme of a phenotypic range. Those individuals usually have greater reproductive success in a particular environment.

Answer:

Directional

Question 15: You are studying a gene which has two alleles, A and

• You determine that in a population of snails, 34% of all alleles of this gene are
• This number (34%, or 0.34) represents the

Answer:

allele frequency of a Question 16: The change in allele frequencies that occur due to the colonization of a new location by a small group of individuals is called

Answer:

the founder effect Question 17: Selection against intermediate-sized beaks in African black-bellied seedcracker finches is an example of which of the following?

Answer:

disruptive selection Question 18: Different alleles of genes are found within different individuals of a population.This is known as ____.

Answer:

genetic variation

Question 19: What is the ultimate source of all new alleles?

Answer:

mutation

Question 20: Sexual selection is a type of natural selection in which the evolution of certain traits is driven by which of the following types of competition?

Answer:

competition for mates Question 21: If the frequency of heterozygotes in a population of mice is 0.48 for a particular gene, what would be the frequency of heterozygotes in future generations if the population is in Hardy-Weinberg equilibrium?

Answer:

0.48 Question 22: Birds that lay intermediate numbers of eggs have greater fitness than birds that lay either too many or too few eggs. This is an example of which type of selection?

Answer:

Stabilizing Question 23: When individuals in a population tend to mate with other individuals that are phenotypically similar, we are observing

Answer:

assortative mating Question 24: Natural populations exhibit significant phenotypic and ____ variation.

Answer:

genotypic Question 25: For a gene with two alleles, A and a, with allele frequencies given by p and q respectively, identify the chance that an offspring will inherit the following combinations of alleles in a population that is in Hardy-Weinberg equilibrium.

Answer:

AA=p2 Aa=2pq aa=q2 Question 26: Which of the following agents of evolutionary change occurs when alleles move from one population to another?

Answer:

gene flow