Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 21, Problem 5TYU

There are 25 individuals in population 1, all with genotype A.A. and there are 40 individuals in population 2, all with genotype aa Assume that these populations are located far from each other and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation most likely resulted from

  1. A.    genetic drift.
  2. B.     gene flow.
  3. C.     nonrandom mating.
  4. D.    directional selection.
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All of the following are causes for evolutionary concern in small populations, EXCEPT:   a. Unmasking of deleterious alleles.   b. Natural selection can be overwhelmed by drift, and thus cannot counterbalance the effects.   c. Random fixation of deleterious alleles is more likely to occur in small populations.   d. Homozygosity decreases more rapidly in smaller populations compared to larger populations.
You are examining population genetics of aquatic iguanas that live on the Galapagos islands. When you go to visit, you notice that the iguanas can easily swim to close neighboring islands but would have swim very long distances to reach further islands.  Which of the following statements is a likely conclusion from your research?   a. Populations are less similar the closer the islands are to each other.   b. The further the islands likely have the greatest genetic diversity.   c. Larger islands always have the lowest heterozygosity.   d. Smaller populations on very small islands exhibit greater population differentiation.
With regard to genetic drift, are the following statements true or false? If a statement is false, explain why. A. Over the long run, genetic drift leads to allele fixation or loss. B. When a new mutation occurs within a population, genetic drift is more likely to cause the loss of the new allele rather than the fixation of the new allele. C. Genetic drift promotes genetic diversity in large populations. D. Genetic drift is more significant in small populations.
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