Question

Compare and contrast stabilizing and directional selection and provide one example for each.

Name: Problem 2, Chapter 11: Biology: Science for Life with Physiology
Uploaded: 2022-03-17T00:44:49-08:00
Duration: 1 min 43 s
Channel: Rachel Griffin
Description: Compare and contrast stabilizing and directional selection and provide one example for each.

   Compare and contrast stabilizing and directional selection and provide one example for each.

Biology: Science for Life with Physiology

Colleen Belk,… 5th Edition

Chapter 11, Problem 2

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Solved by Expert Rachel Griffin

03/17/2022

Step 1

Directional selection is a type of natural selection that favors one extreme phenotype over the other. This can be represented graphically with the original population depicted by a black dotted line and the evolved population depicted by a green line. An example Show more…

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Compare and contrast stabilizing and directional selection and provide one example for each.

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Key Concepts

Stabilizing Selection

Stabilizing selection is a mode of natural selection in which intermediate variants are favored over extremes, leading to a reduction in phenotypic variation within a population. This type of selection maintains the status quo by eliminating individuals at both ends of the distribution, thereby reinforcing the most common traits that are presumed to be optimal under stable environmental conditions.

Directional Selection

Directional selection is a form of natural selection that favors individuals at one extreme of the phenotypic range, resulting in a shift in the population's trait distribution over time. This selection mode occurs when environmental changes or other factors render one variant more advantageous, which in turn leads to a change in the average value of the trait as the favored extreme becomes more common in successive generations.

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