Why are genetic variants with large effects on traits generally rarer than those with smaller effects? Explain how this relates to the observation that the heritability of common diseases is driven by common variants

Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN:9781305251052
Author:Michael Cummings
Publisher:Michael Cummings
Chapter16: Reproductive Technology, Genetic Testing, And Gene Therapy
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Problem 9QP: Cystic fibrosis is an autosomal disease that mainly affects the white population, and 1 in 20 whites...
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Why are genetic variants with large effects on traits generally rarer than those with smaller effects? Explain how this relates to the observation that the heritability of common diseases is driven by common variants 

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