Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 21, Problem 2TYK

The phenomenon in which chance events cause unpredictable changes in allele frequencies is called:

a. gene flow.

b. genetic drift.

c. inbreeding.

d. balanced polymorphism.

e. stabilizing selection.

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A gene exists in two alleles, and the heterozygote has the highest fitness. This situation is likely to result in a. directional selection. c. disruptive selection. b. stabilizing selection. d. balancing selection.
Which of the following statements is true about linkage disequilibrium?   a. New alleles are born into a population in LE with the surrounding loci   b. Genetic hitchhiking results from LD between surrounding loci and a locus under strong selection   c. Loci in LE in two different populations with different allele frequencies will remain in LE when the two populations completely merge into a single population.   d. The greater the selection on a locus, the smaller the haplotype block maintained around it   e. D= 0.15 indicates that two loci are in greater LD than D= -0.23
Consider a gene with two alleles, C and M. The table below describes fitness for different genotypes in two populations.   Fitness   CC CM MM Population 1 1.0 1.0 0.6 Population 2 0.9 0.9 1.0 Which of the following is true based on this table? A.) C is recessive and M is dominant B.) M is recessive and C is dominant  C.) Neither allele is dominant  D.) C is dominant in population 1 and M is dominant in population 2
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