Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 20, Problem 10P
The ability to taste the bitter compound phenylthiocarbamide (PTC) is an autosomal dominant trait. The inability to taste PTC is a recessive condition. In a sample of
a. the recessive allele
b. the dominant allele
c. each genotype
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What are the genotypes of the mother and father in the pedigree below? The pedigree shows albinism (an autosomal recessive trait). The shaded shapes represent albino individuals.
a.
mother - homozygous dominant; father - homozygous dominant
b.
mother - heterozygous; father - homozygous recessive
c.
mother - homozygous recessive; father - heterozygous
d.
mother - heterozygous; father - heterozygous
e.
mother - homozygous dominant; father - homozygous recessive
The chart below is showing 4 generations of a family that is affected by a hereditary disease.
a. Is the disorder being tracked dominant or recessive? How do you know?
b. There is only one possible genotype for person C. True or False?
c. What are the possible genotypes for person A?
d. What are the possible genotypes for person B?,
e. If two people with the same genotypes as person C's spouse and person A's
spouse had a child, what is the probability that the child will be affected by this genetic disorder?
(draw a Punnett square using the correct genotypes to help you).
% chance offspring will be affected
% chance offspring will not be affected
In humans, there is a gene that influences the ability to smell the
thioesters present in urine after asparagus is eaten. The ability to smell
these compounds is an autosomal dominant trait.
A is dominant and confers the ability to smell these thioesters
a is recessive and does NOT confer the ability to smell these
thioesters
p = freq (A) = frequency of allele A in the population = number of A
alleles/ total number of alleles
%3D
q = freq (a) = frequency of allele a in the population
where p + q = 1 and, therefore, p? + 2pq + q? = 1 and
%3D
%D
p? = freq (AA) = frequency of genotype AA = number of AA
individuals/ total number of individuals
%3D
2pq = freq (Aa) = frequency of genotype Aa
q? = freq (aa) = frequency of genotype aa
Phenotype
Number of People
Able to smell thioesters
378
Unable to smell thioesters
1323
Total
1701
1. Calculate p and q for this population.
2. Calculate p?, 2pq, and q? for this population.
Chapter 20 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 20 - 20.1 Compare and contrast the terms in each of the...Ch. 20 - In a population, what is the consequence of...Ch. 20 - 20.3 Identify and describe the evolutionary forces...Ch. 20 - Describe how natural selection can produce...Ch. 20 - Thinking creatively about evolutionary mechanisms,...Ch. 20 - 20.6 Genetic drift, an evolutionary process...Ch. 20 - Over the course of many generations in a small...Ch. 20 - Catastrophic events such as loss of habitat,...Ch. 20 - 20.9 George Udny Yule was wrong in suggesting that...Ch. 20 - 20.10 The ability to taste the bitter compound...
Ch. 20 - Figure 20.6 illustrates the effect of an ethanol ...Ch. 20 - 20.12 Biologists have proposed that the use of...Ch. 20 - 20.13 Two populations of deer, one of them large...Ch. 20 - 20.14 Directional selection presents an apparent...Ch. 20 - 20.15 What is inbreeding depression? Why is...Ch. 20 - 20.16 Certain animal species, such as the...Ch. 20 - Genetic Analysis 20.1 predicts the number of...Ch. 20 - 20.18 In a population of rabbits, and . The...Ch. 20 - Sickle cell disease (SCD) is found in numerous...Ch. 20 - 20.20 Epidemiologic data on the population in the...Ch. 20 - The frequency of tasters and nontasters of PTC...Ch. 20 - Tay-Sachs disease is an autosomal recessive...Ch. 20 - 20.23 Cystic fibrosis (CF) is the most common...Ch. 20 - 20.24 In the mouse, Mus musculus, survival in...Ch. 20 - 20.25 In a population of flowers growing in a...Ch. 20 - Assume that the flower population described in the...Ch. 20 - 20.27 ABO blood type is examined in a Taiwanese...Ch. 20 - 20.28 A total ofmembers of a Central American...Ch. 20 - 20.29 A sample offield mice contains individuals...Ch. 20 - Prob. 30PCh. 20 - Albinism, an autosomal recessive trait...Ch. 20 - 20.32 The frequency of an autosomal recessive...Ch. 20 - 20.33 Evaluate the following pedigree, and answer...Ch. 20 - Evaluate the following pedigree, and answer the...Ch. 20 - The following is a partial pedigree of the British...Ch. 20 - Draw a separate hypothetical pedigree identifying...Ch. 20 - Prob. 37PCh. 20 - 20.38 Achromatopsia is a rare autosomal recessive...Ch. 20 - 20.39 New allopolyploid plant species can arise by...
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