WHAT IS LIFE ACHIEVE ACCESS ONLY >I<
5th Edition
ISBN: 9781319487317
Author: PHELAN
Publisher: INTER MAC
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Chapter 14, Problem 10MC
Summary Introduction
Introduction:
Mycorrhiza is a mutually beneficial association between plants and
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Frequency of
allele A1
Question 2
The graph below shows results of two simulations, both depicting the rise in
frequency of beneficial allele in a population of infinite size. The selection
coefficient and the starting frequency are the same, but in one simulation the
beneficial allele is dominant and in the other it is recessive. Neither allele is
fixed by 500 generations.
1.0
1
0.8
0.6
0.4
2
0.2
0
0
100
200 300
400
500
Generation
(a) Which simulation shows results for a dominant and which shows results for a
recessive allele? How can you tell? (4 pts)
(b) Neither of the alleles reaches fixation by 500 generations. If given enough
time, will both of these alleles reach fixation in the population? Why or why
not? (3 pts)
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Question 14
The relative fitnesses of three genotypes are WA/A= 1.0, WA/a = 0.7, and Wa/a =
0.3. If the population starts at the allele frequency p = 0.5, what is the value of p
in the next generation? (3 pts)
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According to a recent study, 1 out of 50,000 people will be diagnosed with
cystic fibrosis. Cystic fibrosis can be caused by a mutant form of the CFTR gene
(dominant gene symbol is F and mutant is f).
A. Using the rate of incidence above, what is the frequency of carriers of the
cystic fibrosis allele for CFTR in the US? (3 pts)
B. In a clinical study, 400 people from the population mentioned in (A.) were
genotyped for BRCA1 Listed below are the results. Are these results in Hardy-
Weinberg equilibrium? Use Chi Square to show whether or not they are. (3 pts)
BRCA1 genotype
# of women
390
BB
Bb
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10
0
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Chapter 14 Solutions
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