Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 20, Problem 1CCQ
Summary Introduction
To analyze:
Key differences between prezygotic and postzygotic isolating mechanisms
Introduction:
Reproductive isolation occurs when two populations cannot produce fertile offspring by interbreeding. This is the major reason for
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What is the difference between prezygotic and postzygotic reproductive isolating mechanisms? List some different types of each.
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Negative assortative mating means that organisms choose mates that are different
from themselves. If negative assortive mating occurs in a population, what would
expect to happen to genotype frequency over generations?
O a) Frequency of the heterozygous genotype will increase.
b) Frequency of the homozygous genotypes will decrease.
O c) Frequency of the homozygous genotypes will increase.
O d) Both A and B
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Negative assortative mating means that organisms choose mates that are different
from themselves. If negative assortive mating occurs in a population, what would
expect to happen to genotype frequency over generations?
a) Frequency of the heterozygous genotype will increase.
b) Frequency of the homozygous genotypes will decrease.
c) Frequency of the homozygous genotypes will increase.
O d) Both A and B
Chapter 20 Solutions
Principles of Biology
Ch. 20.1 - Prob. 1CCCh. 20.1 - Prob. 1TYKCh. 20.1 - Prob. 2TYKCh. 20.2 - Prob. 1BCCh. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Prob. 1TYKCh. 20.2 - Which of the following is not an example of a...Ch. 20.3 - Prob. 1BCCh. 20.3 - Prob. 1CC
Ch. 20.3 - Which of the following is an example of allopatric...Ch. 20.3 - Prob. 2TYKCh. 20.4 - Prob. 1CCCh. 20.4 - Prob. 2CCCh. 20.4 - Prob. 1TYKCh. 20 - Macroevolution refers to evolutionary changes that...Ch. 20 - Prob. 2TYCh. 20 - Prob. 3TYCh. 20 - Prob. 4TYCh. 20 - Prob. 5TYCh. 20 - Prob. 6TYCh. 20 - Prob. 7TYCh. 20 - Prob. 8TYCh. 20 - Prob. 9TYCh. 20 - Evolutionary changes in the rate or timing of...Ch. 20 - Prob. 1CCQCh. 20 - Compare and contrast different mechanisms of...Ch. 20 - A principle of biology is that populations of...Ch. 20 - Prob. 1CBQCh. 20 - Discuss the type of speciation (allopatric or...
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- What does the Hardy Weinberg equation do? A) Show if a population is evolving B) Shows how many dominant alleles there are C) Does not work with asexual reproductionarrow_forwardA population sample of 300 individuals is studied for the electrophoretic mobility of an enzyme that varies according to the genotype determined by 2 alleles, E and T of a single gene. The results are 7 individuals with genotype EE, 106 with genotype ET, and 187 with genotype TT. What are the allele frequencies of E and T, and what are the expected numbers of the 3 genotypes if random mating is assumed?arrow_forwardWhich mode of selection is acting on the three Biston betularia populations shown? How can you tell from the data in the graph above?arrow_forward
- Refer to the figure above. In their investigation of natural selection on Mc1r alleles (the gene that determines coat color) in Arizona pocket mice, Hoekstra et al. determined the frequency of the D and d alleles in each population. They also determined the frequency of alleles for two neutral mitochondrial DNA genes (genes that do not affect and are not linked to coat color). Why did the researchers include the mitochondrial DNA genes as part of their experimental design? Allele change for the neutral mitochondrial genes serves as an experimental group and gives information on any general background genetic difference among these populations. Allele change for the neutral mitochondrial genes serves as a control and determines coat-color differences among these populations. Allele change for the neutral mitochondrial genes serves as an experimental group and gives information on coat-color differences among these populations. Allele…arrow_forwardAnisogamy is the term for sexual dimorphism in gamete size. a) Discuss the evolution of anisogamy from an ancestor in which gametes had equal size. What factors would lead to a divergence in gamete size among members of a population? b) Sexual selection can be strong in some species, and weaker in others. What determines the strength of sexual selection for a certain species? Discuss the differences in sex roles and Bateman’s Principle in your answer.arrow_forward5a) It is generally considered that blue or purplish colored flowers attract bees as pollinators. Red flowers often attract birds such as hummingbirds as pollinators. Is this an example of prezygotic or postzygotic isolating mechanisms? Why? 5b) The graphs in your textbook show that the parental species are partially isolated by living at somewhat different altitudes in the mountains. In nature, the two parental species are also strongly (but not completely) isolated by using different pollinators (bees vs. hummingbirds). Is the presence of altitudinal separation combined with different pollinators likely to give more reproductive isolation in nature compared to each isolating mechanism alone? Why? 5c) Do the figures showing the F2 generation of the flowers suggest that these traits of flower shape and flower color are polygenic or due to single gene loci? Give a reason for your answer. 5d) Looking at the other graphs for this example that are shown in your textbook, is there any…arrow_forward
- What is inbreeding depression and why is it particularly a concern for conservation biology? A) It is a chemical imbalance in the brain of animals forced into close quarters, such as those rescued from the wild and placed in zoos. B) It is a situation where the frequency of an allele over time depends greatly upon its initial frequency, as such if populations are too small, the present alleles are at risk of being lost. C) It is a situation where offspring of genetic relatives have increased fitness, this occurs when populations of animals are large and they mate freely. D) It is a situation where offspring of genetic relatives have reduced fitness, this occurs when populations of animals become too small and they are thus likely to mate with closely related individuals.arrow_forwardHow would you predict an evolutionary shift from horizontal to vertical transmission of a symbiont in a mutualism would affect the following: 1) partner dependence, 2) partner fitness conflict, and 3) partner genomes. Clearly explain the logic behind your predictions How would you predict an evolutionary shift from horizontal to vertical transmission of a symbiont in a mutualism would affect the following: 1) partner dependence, 2) partner fitness conflict, and 3) partner genomes. Clearly explain the logic behind your predictionsarrow_forwardIf (positive) assortative mating increases in a population, what would expect to happen to genotype frequency over generations? O a) Frequency of the heterozygous genotype will increase. b) Frequency of the homozygous genotypes will decrease. O c) Frequency of the homozygous genotypes will increase. O d) There will be no change in genotype frequency.arrow_forward
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