BIOLOGY: CONCEPTS+INVESTIGATIONS-ACCESS
4th Edition
ISBN: 9781260950618
Author: Hoefnagels
Publisher: MCG CUSTOM
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Chapter 12, Problem 10WIO
Summary Introduction
To explain:
The oscillation in the allele frequencies of A gene.
Concept Introduction:
A small population of the earthworm is pouredin a glass that contains a gene (A) has no fitness effect in the population. Scientist studied the frequency of (A) gene for 20 worm generations. (A) gene contains two alleles that are (A) and (a). During the first generation, (A) allele is present in the population, by the fifth generation, an allele becamemore common than (A). By the twentieth generation, (A)allele became morecommon. The oscillation of allele frequencies of gene (A) occurred due to directional selection.
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Suppose that recessive deleterious allele is found to be much less common than its predicted equilibrium frequency, based on the selection coefficient and mutation rate measured in modern populations. Which of the following is the best explanation for this? Note that, when selection or mutation rates change, it may take hundred of generations for population to reach its new equilibrium.
A. Selection against the allele was weaker in the past than today
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Chapter 12 Solutions
BIOLOGY: CONCEPTS+INVESTIGATIONS-ACCESS
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