Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Chapter 19, Problem 4QP
Summary Introduction
To determine: Whether populations can evolve without changes in allele frequencies.
Introduction: The allele frequency refers to number of times an allele occurs at a specific locus within a population. It can be represented as percentage or in fraction. The allele frequency is indicative of variation at a particular locus.
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Chapter 19 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
Ch. 19.8 - Why dont genetic markers on the Y chromosome...Ch. 19.8 - Prob. 2GRCh. 19 - If you suspected that heterozygous carriers of a...Ch. 19 - If allele frequencies in the hemoglobin gene are...Ch. 19 - Prob. 1QPCh. 19 - How Can We Measure Allele Frequencies in...Ch. 19 - How Can We Measure Allele Frequencies in...Ch. 19 - Prob. 4QPCh. 19 - Prob. 5QPCh. 19 - How Can We Measure Allele Frequencies in...
Ch. 19 - How Can We Measure Allele Frequencies in...Ch. 19 - How Can We Measure Allele Frequencies in...Ch. 19 - Using the HardyWeinberg Law in Human Genetics...Ch. 19 - Prob. 10QPCh. 19 - Using the HardyWeinberg Law in Human Genetics In a...Ch. 19 - Prob. 12QPCh. 19 - Measuring Genetic Diversity in Human Populations...Ch. 19 - Measuring Genetic Diversity in Human Populations...Ch. 19 - Prob. 15QPCh. 19 - Measuring Genetic Diversity in Human Populations...Ch. 19 - Prob. 17QPCh. 19 - Prob. 18QPCh. 19 - Measuring Genetic Diversity in Human Populations...Ch. 19 - Natural Selection Affects the Frequency of Genetic...Ch. 19 - Prob. 21QPCh. 19 - Prob. 22QPCh. 19 - The Evolutionary History and Spread of Our Species...Ch. 19 - Prob. 24QPCh. 19 - Genomics and Human Evolution The Denisovan genome...
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- How Can We Measure Allele Frequencies in Populations? The MN blood group is a single-gene, two-allele system in which each allele is codominant. Why are such codominant alleles ideal for studies of allele frequencies in a population?arrow_forwardHow Can We Measure Allele Frequencies in Populations? Drawing on your newly acquired understanding of the HardyWeinberg equilibrium law, point out why the following statement is erroneous: Because most of the people in Sweden have blond hair and blue eyes, the genes for blond hair and blue eyes must be dominant in that population.arrow_forwardHow Can We Measure Allele Frequencies in Populations? In a population where the females have the allelic frequencies A = 0.35 and a = 0.65 and the frequencies for males are A = 0.1 and a = 0.9, how many generations will it take to reach HardyWeinberg equilibrium for both the allelic and the genotypic frequencies? Assume random mating and show the allelic and genotypic frequencies for each generation.arrow_forward
- How Can We Measure Allele Frequencies in Populations? What are four assumptions of the HardyWeinberg law?arrow_forwardA population with allele frequencies p=0.6 and q=0.4 is subjected to selection against the dominant allele. If selection is completely effective (W11=0, W12=0, W22=1), what will be the frequency of the dominant allele in the next generation?arrow_forwardIt is a common but mistaken belief that because some allele are dominant and others are recessive, the dominants will eventually replace all the recessives in a population. How does the Hardy-Weinberg equilibrium refute this notion?arrow_forward
- Describe how the phenotype of individuals with sickle-cell disease influences how common the HbS allele is in the population: Do individuals with sickle-cell disease typically have many offspring? What effect does the fact that individuals with sickle-cell disease do not produce many offspring have on the frequency of the HbS allele in the population over time? Given this, do you expect the HbS allele to be common or rare in populations?arrow_forwardYou are a scientist studying a population of beetles. Beetle color is controlled by two alleles at a single genetic locus. AA beetles are blue, Aa purple, and aa pink. You count 30 blue beetles, 10 purple beetles, and 40 pink beetles. a) What is the frequency of the A allele? [ Select ] b) What is the observed frequency of the Aa genotype? 1 Select ] c) Under Hardy-Weinberg equilibrium, what is the expected frequency of the aa gentoype? [ Select ] d) Is this beetle population evolving? I Select ]arrow_forwardYou are given the frequencies of all three genotypes (AA, Aa, aa) in a population, and all three are non-zero. Under what conditions can you determine allele frequencies? a) Only if the population is in Hardy-Weinberg equilibrium b) Only if the population is NOT in Hardy-Weinberg equilibrium c) Always: It doesn't matter whether or not the population is in Hardy-Weinberg equilibriumarrow_forward
- You are studying a single-gene locus with two alleles in a population that is in Hardy–Weinberg equilibrium. Examination of a large sample of individuals from the population reveals there are six times as many heterozygotes as there are homozygote recessive individuals in this population. What is the frequency of the recessive allele? I don't know how to start his calculation with just a ratio of 6:1 I found an answer online that says the frequency of q=0.25 but the calculations (below) don't make sense to me. Please help me. What is the answer and how do I get to it? Hardy-Weinberg equation p2+2pq+q2=1 2pq/q2= 6/1 2p= 6q 2(1-p)= 6q 2-2q=6q q=0.25arrow_forwardYou are given the frequencies of both alleles (A and a) in a population, and both are non-zero. Under what conditions can you determine genotype frequencies? a) Only if the population is in Hardy-Weinberg equilibrium b) Only if the population is NOT in Hardy-Weinberg equilibrium c) Always: It doesn't matter whether or not the population is in Hardy-Weinberg equilibriumarrow_forwardExample: I go to a different population of fruit flies that have the same two alleles for eye-color. I suspect that the alleles occur in different frequencies in this second population. I sample 1000 flies and discover 10 that have brown eyes. What are the estimated frequencies of the "R" and "r" alleles in this population? Answer: Again, p2 + 2pq + q2 = 1. The term q2 = the relative frequency of homozygous recessive individuals, which corresponds to the ten brown-eyed flies I counted out of 1000 flies sampled. Thus, q2 = 10/1000 = 1/100. q = the square root of 1/100 or 0.1. Thus the frequency of "r" in this second population is 0.1 and the frequency of the "R" allele is 1 - q or 0.9. Problem 1: Phenylketonuria (PKU) is a disease caused by the build-up of the byproducts of metabolizing phenylalanine. It is caused by a defective, recessive allele. If a child is homozygous for this recessive allele, it will develop PKU. In the United States, PKU is detected in approximately 1 in 10,000…arrow_forward
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