Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
3rd Edition
ISBN: 9780134895727
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 2TYU
Sparrows With average-sized w1ngs survive severe storms better than those with longer or shorter wings, illustrating
- A. the bottleneck effect
- B. disruptive selection.
- C. frequency-dependent selection.
- D. stabilizing selection.
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Students have asked these similar questions
Which of the following changes would cause directional selection?
a
A habitat made of trees with light-colored bark and newly soot-covered bark results in moths that are either white or black.
b
An increase in intermediate-colored rocks leads to the decrease in light-colored mice and dark-colored mice.
c
A shortage of water leads to the death of many aquatic plants.
d
There is an abundance of large seeds available, leading to an increase in the beak size of birds.
Some females seem to prefer the green colouration and some females seem to prefer the blue colouration. What type of selection is this an example of?
a. stabilizing
b. balancing
c. directional
d. diversifying
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.
Chapter 21 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Ch. 21.1 - Explain why genetic variation within a population...Ch. 21.1 - Of all the mutations that occur in a population,...Ch. 21.1 - Prob. 3CCCh. 21.2 - A population has 700 individuals, 85 of genotype...Ch. 21.2 - The frequency of allele a is 0.45 for a population...Ch. 21.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 21.3 - In what sense is natural selection more...Ch. 21.3 - Distinguish genetic drift from gene flow in terms...Ch. 21.3 - WHAT IF? Suppose two plant populations exchange...Ch. 21.4 - What is the relative fitness of a sterile mule?...
Ch. 21.4 - Explain why natural selection is the only...Ch. 21.4 - Consider a population in which heterozygotes at a...Ch. 21 - Natural selection changes allele frequencies...Ch. 21 - Sparrows With average-sized w1ngs survive severe...Ch. 21 - If the nucleotide variability of a locus equals...Ch. 21 - There are 25 individuals in population 1, all with...Ch. 21 - A fruit fly population has a gene with two...Ch. 21 - FOCUS ON EVOLUTION Using at least TWO examples,...Ch. 21 - Prob. 8TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
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- When we take, say, 100 individuals of a species of beetle from the wild and place them in a new environment that is not so different that they are unable to thrive but different enough so that they are experiencing a new selective regime, say, a lower temperature, what typically happens? A - Sexual selection causes some larvae to be able to survive in the cooler temperatures and other individuals to be unable to survive because they need warmer temperatures. B - We are unable to measure phenotypic selection, presumably because we do not have much variation among individuals for how they handle temperature. C - The founder event assures us that the new population will be strictly representative of the source population (especially if we took all the 100 from the same location rather that from throughout the range of the species). D - The population evolves to be tolerant of the lower temperature; it can do this because of latent variation already in the 100 founding individuals. E -…arrow_forwardWhich of the following is NOT true of stabilising selection a. it occurs when inidivuals with extreme trait values have lower fitness than those with intermediate trait values. b. it keeps the mean close (or moves it closer) to the optimum value c. it can result from opposing directional selection, such as when early flowering makes flowers susceptible to herbivores, but late flowering reduces the availability of pollinators. d. it does not improve the fitness of the population to the environment. e. it decreases the range of variation in the populationarrow_forwardConsider a hypothetical beetle population, in which beetle colour variesalong a spectrum from light to dark green. When introduced to anenvironment characterized by light green moss and dark green shrubs,both light and dark green beetles have higher fitness than medium greenbeetles. Which of the following terms best describes this situation? Select one:O a. Stabilizing selectionO b. Directional selectionO c. Disruptive selectionO d. Sexual selectionarrow_forward
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