Campbell Biology in Focus, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433769
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 3TYU
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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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, Books a la Carte Edition; Modified Mastering Biology with Pearson eText - ValuePack Access Card - for Campbell Biology in Focus (2nd 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 - Prob. 3CCCh. 21 - Natural selection changes allele frequencies...Ch. 21 - No two people are genetically identical, except...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. 9TYUCh. 21 - SYNTHESIZE YOUR KNOWLEDGE This kettle lake formed...
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- The Grants have studied finches on the Galapagos Islabds for 40+ years. During times of drought there is less green/flowering vegetation available as a good source for the finches. This leaves only the hard seeds. The grants have found that during drought, finches with larger beaks survive at a higher rate because they can access food source. This would be an example of ____ A.Selective pressure B. good genes hypothesis C. handicap principle D. population variationarrow_forwardWhich of the following traits does not describe a r-selected species? A. rapid development B. low parental investment C. high reproductive rates D. short life spans E. late maturationarrow_forwardIn marine iguanas males are much larger than females and fight with one another for access to areas that are preferred by females. What type of evolutionary force is causing the increase in male size? Group of answer choices A. disruptive (natural) selection B. intrasexual selection C. disruptive (natural) selection D. stabilizing (natural) selection E. intersexual selectionarrow_forward
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