Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 19, Problem 19CTQ
Describe a situation in which a population would undergo the bottleneck effect and explain what impact that would have on the population’s gene pool.
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What is gene flow defined as?
Group of answer choices
A-production of new alleles
B-chance loss of alleles in a population
C-exchange of genes between populations
D-production of new genetic material
E-differential reproductive success of individuals
Explain the significance of stability in a population’s gene pool.
Describe what happens to allele frequencies as a result of the bottleneck effect. Discuss the relevance of this effect with regard to species that are approaching extinction.
Chapter 19 Solutions
Biology 2e
Ch. 19 - Figure 19.2 In plants, violet flower color (V) is...Ch. 19 - Figure 19.4 Do you think genetic drift would...Ch. 19 - Figure 19.8 In recent years, factories have become...Ch. 19 - What is the difference between micro- and...Ch. 19 - Population genetics is the study of: how selective...Ch. 19 - Which of the following populations is not in...Ch. 19 - One of the original Amish colonies rose from a...Ch. 19 - When male lions reach sexual maturity, they leave...Ch. 19 - Which of the following evolutionary forces can...Ch. 19 - What is assortative mating? when individuals mate...
Ch. 19 - When closely related individuals mate with each...Ch. 19 - What is a cline? the slope of a mountain where a...Ch. 19 - Which type of selection results in greater genetic...Ch. 19 - When males and females of a population look or act...Ch. 19 - The good genes hypothesis is a theory that...Ch. 19 - Solve for the genetic structure of a population...Ch. 19 - Explain the Hardy-Weinberg principle of...Ch. 19 - Imagine you are trying to test whether a...Ch. 19 - Describe a situation in which a population would...Ch. 19 - Describe natural selection and give an example of...Ch. 19 - Explain what a cline is and provide examples.Ch. 19 - Give an example of a trait that may have evolved...Ch. 19 - List the ways in which evolution can affect...
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- Describe the impact of founder effects and population bottlenecks on the genetic diversity of human populations. Provide examples of populations that have experienced these events and discuss their implications for the genetic makeup of contemporary human groups.arrow_forwardFounder effects are most prominent in geographically, culturally or religiously isolated populations that undergo rapid expansion from a limited number of ancestors, when, as a consequence of low genetic diversity, some alleles become more frequent. True Falsearrow_forwardGive the major factors that cause changes in the genotype and allele frequencies of a population through generations. briefly explain eacharrow_forward
- What long-term effects can gene flow have on any two populations that are exchanging genes? View keyboard shortcutsarrow_forwardA population is solely comprised of 120 A2A2 individuals. 18 A1A1 individuals migrate in and contribute to the mating pool. What is the frequency of A1A2 individuals in the offspring? Answer to 2 decimal places. Hint: Use the Gene Flow table!arrow_forwardBASED ON THIS GRAPH: A small community that is heavily infested with mosquitoes was sprayed weekly with the insecticide DDT for several months. Daily counts providing information on mosquito population size are represented in the graph below. Provide a biological explanation for the changes in the mosquito population over time. Use the terms: insecticide resistance/resistant, natural selection, favorable trait, reproduce, mutation/sexual reproductionarrow_forward
- Explain : Populations of organisms evolve over generations to have more individuals with favorable traits.arrow_forwardThe graph below includes information on the average time to fixation of an allele (in generations) as a function of population size. The three different curves represent different starting allele frequencies. Which of the following statements correctly describes patterns depicted in the graph below? I. As population size increases, it takes fewer generations for alleles to reach fixation II. As starting allele frequency increases, it takes fewer generations for alleles to reach fixation III. Small populations will lose alleles more rapidly than large populations. IV. Even if starting allele frequency is low, fixation is possible - it just happens slowly. Only III is a correct description Only II is a correct description II, III, & IV are correct descriptions Both II & III are correct descriptions Both I & II are correct descriptions All four statements (I, II, III & IV) are correct descriptions asap pleasearrow_forwardWill the bottleneck effect most likely increase or decrease the genetic variation of a population? Pick one and explain why.arrow_forward
- The Mauritius kestrel is found on the island of Mauritius in the Indian Ocean. In 1974, the population went through a bottleneck of one male and one female. The population had fewer than 10 birds throughout the 1970s and did not increase in size until the 1990s. Assume that the population size was 5 birds for 4 generations and estimate what proportion of the original heterozygosity remained in the population after the bottleneck. Report your answer as a proportion to the nearest 0.001. Type your answer... DDarrow_forwardDescribe a population that is exhibiting rapid evolutionary change.arrow_forwardDoes having a dominant allele mean that it will be found in greater frequency in the population? Explainarrow_forward
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