BIOLOGY:CONCEPTS+INVESTIGATIONS (LL)W/AC
5th Edition
ISBN: 9781307123067
Author: Hoefnagels
Publisher: MCG/CREATE
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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
B. Mutation rates were higher in the past
C. Heterozygote advantage in some environments
D. Increases lifespans have made the allele more deleterious now than it was in the
Please answer asap and in short and content should not be palgarised please
Suppose that gene B occurs in a unicorn population where the frequency of the B1 allele is 0.5 and the frequency of the B2 allele is 0.4. What is the frequency of the B3 allele, assuming that there are only 3 alleles in the population? O The frequency of B3 = 0.1 because 0.5 +0.4+ B3 = 1. O The frequency of B3= (0.4)2 = 0.16 O The frequency of B3= 0.9 because 0.5 +0.4 = 0.9 O There is not enough information to determine the frequency of the B3
If gene A/a is not in Hardy-Weinberg equilibrium due to natural selection such that individuals with the genotype AA have a fitness value of 1.0, heterozygotes have only slightly reduced fitness at 0.9, and individuals with the genotype aa have a fitness value of 0.6, what kind of change in allele frequency would you expect to see over time assuming you start with equal frequencies of the 2 alleles?
Chapter 12 Solutions
BIOLOGY:CONCEPTS+INVESTIGATIONS (LL)W/AC
Ch. 12.1 - What are two ways to define evolution?Ch. 12.1 - Prob. 2MCCh. 12.2 - How does the history of evolutionary thought...Ch. 12.2 - What did Darwin observe that led him to develop...Ch. 12.2 - How might artificial selection and natural...Ch. 12.2 - What is the modern evolutionary synthesis?Ch. 12.3 - Prob. 1MCCh. 12.3 - Prob. 2MCCh. 12.3 - How can natural selection favor different...Ch. 12.3 - Prob. 4MC
Ch. 12.3 - Prob. 5MCCh. 12.4 - Prob. 1MCCh. 12.4 - Prob. 2MCCh. 12.4 - Prob. 3MCCh. 12.4 - Prob. 4MCCh. 12.5 - Prob. 1MCCh. 12.5 - Prob. 2MCCh. 12.6 - Prob. 1MCCh. 12.6 - What is the difference between intrasexual...Ch. 12.7 - Prob. 1MCCh. 12.7 - South China tigers have two color patterns...Ch. 12.7 - Prob. 3MCCh. 12.7 - Prob. 4MCCh. 12.8 - What hypothesis did Conover and Munch test?Ch. 12.8 - Prob. 2MCCh. 12 - Prob. 1MCQCh. 12 - Prob. 2MCQCh. 12 - What is the most accurate way to ex plain the...Ch. 12 - Prob. 4MCQCh. 12 - Prob. 5MCQCh. 12 - Prob. 6MCQCh. 12 - List and describe five mechanisms of evolutionCh. 12 - How did James Hutton, Georges Cuvier,...Ch. 12 - Explain how understanding evolution is important...Ch. 12 - How does variation arise in an asexually...Ch. 12 - Write a paragraph that describes the connections...Ch. 12 - Explain how harmful recessive alleles can persist...Ch. 12 - Fraggles are mythical, mouselike creatures that...Ch. 12 - Prob. 8WIOCh. 12 - Jellyfish Lake, located on the Pacific island of...Ch. 12 - Prob. 10WIOCh. 12 - Review the Survey the Land scape figu re in th e...Ch. 12 - Describe a s ituation in which each of the five...Ch. 12 - Add the terms genotype, phenotype, allele...
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