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 32P
The frequency of an autosomal recessive condition is
a. What is the frequency of the mutant allele?
b. What is the frequency of carriers of the mutant allele?
c. Assuming individuals mate at random, what is the chance that two heterozygous individuals will mate?
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A) Explain why we use the concept of Hardy-Weinberg Equilibrium if populations are never stable?
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(In other words, if you have extra spotted fish in a generation, what has happened?)
In a population of mountain lions, 9% of the individuals suffer from a disease caused by a recessive allele (aa).
A) Calculate the frequency of both the dominant and recessive alleles.
B) What is the percentage of homozygous dominant individuals and what is the percentage of heterozygous individuals in the population?
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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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- What does the Hardy Weinberg equation do? A) Show if a population is evolving B) Shows how many dominant alleles there are C) Does not work with asexual reproductionarrow_forwardCystic fibrosis (CF) is a recessive autosomal disorder. In certain populations of Northern European descent, the number of people born with this disorder is about 1 in 2500. Assuming Hardy- Weinberg equilibrium for this trait: A. What are the frequencies for the normal and CF alleles? B. What are the genotype frequencies of homozygous normal, heterozygous, and homozygous affected individuals? C. Assuming random mating, what is the probability that two phenotypically unaffected heterozygous carriers will choose each other as mates?arrow_forwardAlbinism is due to a recessive allele of an autosomal gene. Let a represent the albino allele and A represent the normal non-albino allele. If one out of every 10,000 people were albino and assuming that the population is in Hardy-Weinberg equilibrium, A. what would be the phenotype frequencies of albino and non-albino ? B. what would be the allele frequencies of a and of A? C. what fraction of people can be expected to be of the genotype Aa? D. what fraction of people can be expected to be of the genotype AA?arrow_forward
- The diagram below represents results of agarose gel electrophoresis performed after PCR amplification of a molecular marker in diploid organisms. Answer the following questions: a) How many individuals are homozygous and how many are heterozygous? b) How many alleles are there in this population?arrow_forwardIn a given population, 1 out of 400 individuals has cancer caused by a recessive allele g. Assuming the population is in Hardy-Weinberg equilibrium, what is the expected proportion of individuals who are carriers?arrow_forwardUsing the pedigree shown here, answer the following questions for individual VI-1. A. Is this individual inbred? B. If so, who is/are her parents’ common ancestor(s)? C. Calculate the inbreeding coefficient for VI-1. D. Are the parents of VI-1 inbred?arrow_forward
- Consider the Hardy-Weinberg equations. If the frequency of a recessive allele is 0.3, what is the frequency of the dominant allele?arrow_forwardSuppose in a certain population there are 100 individuals homozygous for the A1 allele, 400 individuals homozygous for the A2 allele, and 500 heterozygous individuals. What are the genotype frequencies? What are the allele frequencies?arrow_forwardSuppose that in wasps, brown wings are dominant to white wings, and 40% of all wasps in a population you’ve sampled have white wings. a. What percentage of the wasps is heterozygous?b. What percentage of the wasps is homozygous dominant?arrow_forward
- After five generations of random mating, what is the frequency of the a allele?arrow_forwardPlease answer fast In a population of 2 individuals, how much does heterozygosity decrease in 1 generation?The endangered Arabian oryx population is being restored from 9 individuals under captive breeding in the Phoenix Zoo. How much does heterozygosity decline eachgeneration?arrow_forwarda) The allele frequency of albinism is 0.12 in a population of 450 individuals. If the number of individuals that are carriers of albinism is 101. Calculate the number of individuals with normal pigmentation? b) A rare disease which is due to a recessive allele (A) that is lethal when homozygous occurs within a specific population at a frequency of three in a million. How many individuals in a town with a population of 3000 will be expected to carry this allele?arrow_forward
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