BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 17, Problem 3SA

Match the modes of natural selection with their best description.

____ stabilizing a. eliminates extreme forms of a trait
____ directional b. eliminates midrange forms of a trait
____ disruptive c. shifts phenotypes in one direction
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A(n) _____ makes a species better suited to its environment.a. homologous traitb. adaptationc. analogous traitd. mutation
Stabilizing selection on a trait tends toa. make the trait more extreme.b. reduce variability in the trait.c. decrease the frequency of alleles associated with the trait.d. result in elaborate male ornaments.
People who are heterozygous for the cystic fibrosis gene are morelikely than others to survive a cholera epidemic. This heterozygoteadvantage seems to explain why homozygotes are maintained in thehuman population, and is an example ofa. disruptive selection.b. balanced polymorphism.c. high mutation rate.d. nonrandom mating.
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