Campbell Biology (11th Edition)
Campbell Biology (11th Edition)
11th Edition
ISBN: 9780134093413
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 24, Problem 5TYU

Which of the following factors would not contribute to allopatric speciation?

  • (A) The separated population is small, and genctic drift occurs.
  • (B) The isolated population is exposed to different selection pressures than the ancestral population.
  • (C) Different mutations begin to distinguish the gene pools of the separated populations.
  • (D) Gene flow between the two populations is extensive.
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21) ALL BUT ONE of the statements below helps to describe gene flow. That is A) B) Without genetic variation, some of the basic mechanisms of evolutionary change cannot operate. There are three primary sources of genetic variation: 1. Mutations II. Gene flow III. Sexual reproduction D) It depends on a chance event that changes the gene pool. It can reduce the genetic differentiation between the two groups. It involves the movement of alleles from one population to another. It includes migration or the movement of individuals between populations. Some mutations always occur from generation to generation. But most mutations do not persist over time in the gene pool. Which mutation is MOST likely to become established and persist in a species?
According to the punctuated equilibria model,(A) given enough time, most existing species will branchgradually into new species.(B) most new species accumulate their unique features relatively rapidly as they come into existence, then changelittle for the rest of their duration as a species.(C) most evolution occurs in sympatric populations.(D) speciation is usually due to a single mutation.
1. a) List the forces affecting the evolution of natural populations b) all these factors in (a) influence the genetic variation in natural populations. Briefly explain how these factors influence or affect genetic variation.
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Mechanisms of Genetic Change or Evolution; Author: Scientist Cindy;https://www.youtube.com/watch?v=5FE8WvGzS4Q;License: Standard Youtube License