Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 26, Problem 1CS
In a region of Quebec, Canada, 1 in 22 people are heterozygous for the mutant tyrosinemia allele. Using the frequency of heterozygotes, calculate the frequency of recessive homozygotes in this population. What might explain the difference between the frequency of tyrosinemia in the U.S. population and in this particular Canadian population?
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Cystic fibrosis is an autosomal recessive disorder that affects 1 in 3 000 newborns with Caucasian background. It causes thick mucus build up in various organs and can cause damages and problems in respiratory and digestive systems.
a) What is the frequency of the cystic fibrosis allele in the Caucasian population? Show all your work and express your answer as a value between 0 and 1 rounded to two decimal places.
b) What percentage of the Caucasian population would be carriers for cystic fibrosis? Show all your work and express your answer rounded to two decimal places.
c)If two individuals are carriers of the cystic fibrosis allele, what is the probability that they would have a girl without cystic fibrosis? Show all your work (including the Punnett square) and express your answer as a value between 0 and 1 rounded to two decimal places.
The amount of enzyme activity in a cell that is homozygous for a mutant allele is 20 units. The amount of enzyme activity in a cell homozygous for the WT allele is 10 units. It is known that 14 units of enzyme activity is required to show the trait. What is the dominance relationship between the WT and mutant allele for the phenotype of amount of enzyme per cell?
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B) The mutant allele is dominant.
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D) The WT and mutant alleles show incomplete dominance.
E) It is impossible to determine from the information given.
A total of 1000 members of a Central American population are typed for the ABO blood group. In the sample, 421 have blood type A, 168 have blood type B, 336 have blood type
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Part A
Use this information to determine the frequency of ABO blood group alleles in the sample.
Recall that when considering genes with three alleles whose frequencies are represented by the variables p, q, and r, the sum of genotype frequencies resulting from trinomial
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Chapter 26 Solutions
Concepts of Genetics (12th Edition)
Ch. 26 - The ability to taste the compound...Ch. 26 - Determine whether the following two sets of data...Ch. 26 - If the albino phenotype occurs in 1/10,000...Ch. 26 - A prospective groom, who is unaffected, has a...Ch. 26 - In a region of Quebec, Canada, 1 in 22 people are...Ch. 26 - Critics argue that a uniform panel of disorders...Ch. 26 - Others argue that the current testing system...Ch. 26 - HOW DO WE KNOW? Population geneticists study...Ch. 26 - CONCEPT QUESTION Read the Chapter Concepts list on...Ch. 26 - Price et al. [(1999).J. Bacteriol181:2358-2362)...
Ch. 26 - The genetic difference between two Drosophila...Ch. 26 - The use of nucleotide sequence data to measure...Ch. 26 - Prob. 6PDQCh. 26 - What must be assumed in order to validate the...Ch. 26 - In a population where only the total number of...Ch. 26 - If 4 percent of a population in equilibrium...Ch. 26 - Consider a population in which the frequency of...Ch. 26 - If the initial allele frequencies are p = 0.5 and...Ch. 26 - Under what circumstances might a lethal dominant...Ch. 26 - Assume that a recessive autosomal disorder occurs...Ch. 26 - One of the first Mendelian traits identified in...Ch. 26 - Describe how populations with substantial genetic...Ch. 26 - Achondroplasia is a dominant trait that causes a...Ch. 26 - Prob. 17PDQCh. 26 - Prob. 18PDQCh. 26 - A botanist studying water lilies in an isolated...Ch. 26 - A farmer plants transgenic Bt corn that is...Ch. 26 - In an isolated population of 50 desert bighorn...Ch. 26 - To increase genetic diversity in the bighorn sheep...Ch. 26 - What genetic changes take place during speciation?Ch. 26 - Some critics have warned that the use of gene...Ch. 26 - Prob. 25PDQCh. 26 - What are the two groups of reproductive isolating...Ch. 26 - A form of dwarfism known as Ellisvan Creveld...Ch. 26 - The original source of new alleles, upon which...Ch. 26 - A number of comparisons of nucleotide sequences...Ch. 26 - Shown below are two homologous lengths of the...Ch. 26 - Recent reconstructions of evolutionary history are...
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