Compare and contrast directional selection and disruptive selection, and provide an example of each.

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Compare and contrast directional selection and disruptive selection, and provide an example of each.

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Basic introduction

Directional selection is a kind of natural selection in which only a single phenotype is favored which causes allele frequency to continuously shift in one direction. When there is a change in an environment, populations will often undergo directional selection, which selects for phenotypes at one end of the spectrum of existing variation.

Disruptive selection is also called diversifying selection which is a kind of natural selection in which extreme values for a trait are favored over intermediate values. 

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