BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 20, Problem 1U
Assortative mating
a. affects genotype frequencies expected under Hardy–Weinberg equilibrium.
b. affects allele frequencies expected under Hardy–Weinberg equilibrium.
c. has no effect on the genotypic frequencies expected under Hardy–Weinberg equilibrium because it does not affect the relative proportion of alleles in a population.
d. increases the frequency of heterozygous individuals above Hardy–Weinberg expectations.
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A population of birds may have red feathers Show work here: (the dominant phenotype) or orange feathers (the recessive phenotype). Red feathered birds have the genotype RR or Rr. Orange feathered birds have the genotype r. The fequency of the RR genotype is 46.
a. What is the frequency of heterozygous birds?
b. What is the frequency of the R allele?
c. What is the frequency of the r allele?
Consider a gene with two alleles, L and M, that exhibit complete dominance. The
table below provides the relative fitnesses of the three genotypes in two
populations.
LL
LM
MM
Population 1
0.8
0.3
0.3
Population 2
0.9
1.0
1.0
a. Which allele is dominant, and how do you know?
b. Which allele will increase (in each population), and how do you know?
c. In which population will the change in allele frequencies occur more
quickly, and how do you know?
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
Chapter 20 Solutions
BIOLOGY
Ch. 20.1 - Define evolution and population genetics.Ch. 20.1 - Prob. 2LOCh. 20.2 - Explain the HardyWeinberg principle.Ch. 20.2 - Describe the characteristics of a population that...Ch. 20.2 - Prob. 3LOCh. 20.3 - Define the five processes that can cause...Ch. 20.3 - Prob. 2LOCh. 20.4 - Prob. 1LOCh. 20.4 - Prob. 2LOCh. 20.4 - Demonstrate how the success of different...
Ch. 20.5 - Prob. 1LOCh. 20.5 - Prob. 2LOCh. 20.5 - Prob. 3LOCh. 20.6 - Define frequency-dependent selection, oscillating...Ch. 20.6 - Prob. 2LOCh. 20.7 - Define and contrast disruptive, directional, and...Ch. 20.7 - Prob. 2LOCh. 20.8 - Explain how experiments can be used to test...Ch. 20.9 - Prob. 1LOCh. 20.9 - Prob. 2LOCh. 20.10 - Prob. 2LOCh. 20 - If all white cats died, what proportion of the...Ch. 20 - Assuming that the values on the x-axis represent...Ch. 20 - Prob. 3DACh. 20 - Prob. 4DACh. 20 - Examine the index of copper tolerance on nonmine...Ch. 20 - Prob. 6DACh. 20 - Why are rare alleles particularly likely to be...Ch. 20 - Prob. 2IQCh. 20 - Prob. 3IQCh. 20 - Prob. 4IQCh. 20 - Prob. 5IQCh. 20 - Prob. 6IQCh. 20 - Prob. 7IQCh. 20 - Prob. 8IQCh. 20 - Prob. 9IQCh. 20 - Assortative mating a. affects genotype frequencies...Ch. 20 - When the environment changes from year to year and...Ch. 20 - Many factors can limit the ability of natural...Ch. 20 - Stabilizing selection differs from directional...Ch. 20 - Founder effects and bottlenecks are a. expected...Ch. 20 - Relative fitness a. refers to the survival rate of...Ch. 20 - For natural selection to result in evolutionary...Ch. 20 - Prob. 8UCh. 20 - In a population of red (dominant allele) or white...Ch. 20 - Genetic drift and natural selection can both lead...Ch. 20 - Prob. 3ACh. 20 - Prob. 4ACh. 20 - In Trinidadian guppies a combination of elegant...Ch. 20 - On large, black lava flows in the deserts of the...Ch. 20 - Based on a consideration of how strong artificial...
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