Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Chapter 23, Problem 5TYU
Summary Introduction
Introduction: A population is in Hardy-Weinberg equilibrium where the allele and genotype frequencies remain constant over generations. Hardy-Weinberg equilibrium follows the given equation, p2 + 2pq + q2 = 1, where, p2 represents the dominant homozygous genotype, q2 represents the recessive homozygous genotype and 2pq represent the heterozygous genotype.
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You 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?
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d) Is this beetle population evolving? I Select ]
You have collected and determined genotypes of 200 individuals from a population of thr fruit fly, Drosophila pseudoobscura. Your sequencing study revealed 20 individuals with genotype AA, 70 individuals with genotype Aa and 110 individuals with genotype aa.
i) what are your theoretical expectations for the number of individuals with each genotype if the population is in Hardy-Weinberg equilibrium.
ii) Based on the genotype counts observed, is there evidence that this population of fruit flies deviates from your theoretical expectations under Hardy-Weinberg equilibrium?
A) Explain why we use the concept of Hardy-Weinberg Equilibrium if populations are never stable?
B) What do the mathematical results tell us if the allele frequencies do not match our predictions?
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Chapter 23 Solutions
Bio 121 Campbell Biology Truman College
Ch. 23.1 - Explain why genetic Variation within a population...Ch. 23.1 - Ot all the mutations that occur in a population,...Ch. 23.1 - MAKE CONNECTIONS If a population stopped...Ch. 23.2 - A population has 700 individuals, 85 of genotype...Ch. 23.2 - The frequency of allele a is 0.45 for a population...Ch. 23.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 23.3 - In what sense is natural selection more...Ch. 23.3 - Distinguish genetic draft from gene flow in terms...Ch. 23.3 - WH AT IF? Suppose two plant populations exchange...Ch. 23.4 - What is the relative fitness of a sterile mule?...
Ch. 23.4 - Explain why natural selection is the only...Ch. 23.4 - Prob. 3CCCh. 23 - Typically. most of the nucleotide variabillity...Ch. 23 - Is it circular reasoning to calculate p ond q from...Ch. 23 - Would two small, geographically isolated...Ch. 23 - How might secondary sex characteristics in males...Ch. 23 - Natural selection changes allele frequencies...Ch. 23 - Prob. 2TYUCh. 23 - Prob. 3TYUCh. 23 - There are 25 individuals in population 1, all with...Ch. 23 - Prob. 5TYUCh. 23 - EVOLUTION CONNECTION Using at least two examples,...Ch. 23 - SCIENTIFIC INQUIRY INTERPRET THE DATA Researchers...Ch. 23 - Prob. 8TYUCh. 23 - SYNTHESI2E YOUR KNOWLEDGE This kettle lake forracd...
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