Stabilizing selection differs from directional selection...

Name: Problem 4, Chapter 20: Biology
Uploaded: 2021-04-08T15:58:11-08:00
Duration: 2 min 40 s
Channel: Christina Sorrentino
Description: Stabilizing selection differs from directional selection because a. in the former, phenotypic variation is reduced but the average phenotype stays the same, whereas in the latter both the variation and the mean phenotype change. b. the former requires genetic variation, but the latter does not. c. intermediate phenotypes are favored in directional selection. d. None of the choices is correct.

Stabilizing selection differs from directional selection because a. in the former, phenotypic variation is reduced but the average phenotype stays the same, whereas in the latter both the variation and the mean phenotype change. b. the former requires genetic variation, but the latter does not. c. intermediate phenotypes are favored in directional selection. d. None of the choices is correct.

Stabilizing selection differs from directional selection because
a. in the former, phenotypic variation is reduced but the average phenotype stays the same, whereas in the latter both the variation and the mean phenotype change.
b. the former requires genetic variation, but the latter does not.
c. intermediate phenotypes are favored in directional selection.
d. None of the choices is correct.

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Key Concepts

Phenotypic Variation

Phenotypic variation refers to the observable differences in traits among individuals within a population. This variation provides the raw material for natural selection, as different traits can confer different levels of fitness in varying environments.

Mean Phenotype

The mean phenotype is the average value or expression of a trait in a given population. Changes in the mean phenotype can indicate shifts in the population’s overall trait distribution, often as a result of directional selection, whereas stabilizing selection tends to maintain a constant mean phenotype.

Stabilizing Selection

Stabilizing selection is a type of natural selection where individuals with intermediate phenotypes have a higher fitness than those with extreme values, leading to a reduction in phenotypic variation within a population while keeping the population’s average phenotype relatively constant.

Directional Selection

Directional selection is the process in natural selection where one extreme phenotype is favored, leading to a shift in the population’s mean phenotype over time. This type of selection often increases the frequency of that favored trait while altering the overall phenotype distribution.

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