Campbell Biology: Custom Edition
18th Edition
ISBN: 9781323717271
Author: Urry, Cain, Wasserman, Minorsky, Reece
Publisher: PEARSON C
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Textbook Question
Chapter 23.2, Problem 3CC
WHAT IF? → A locus that affects susceptibility to a degener-ative bram discasc has two alleles, V and v. In a population, 16 people have genotype VV, 92 have geootype Vv, and 12 have genotype vv. Is this population evolving? Explain.
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Phenotype to Population
1. 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?
which of the multiple choice?
Activity 1
Write down the correct biological term for each of the following descriptions in the space provided.
DESCRIPTION
TERM
1.1
A cross involving a single characteristic
1.2
A cross involving two characteristics
A representation that traces the transmission of a characteristic over many
generations of a family
Allele that influences the phenotype only when in the homozygous
combination but not in the heterozygous condition
1.3
1.4
1.5
Allele that influences the phenotype whether in the homozygous or
heterozygous combination
1.6
Alternative forms of a gene found at the same locus
1.7
Characteristics controlled by alleles of a gene that are located on the sex
chromosomes
Cross involving alleles of a gene that are equally dominant, leading to a third
phenotype which is a combination of the other two phenotypes
1.8
1.9
Cross involving alleles that are neither dominant or recessive, leading to an
intermediate phenotype
1.10
Cross involving characteristics controlled by dominant and…
Chapter 23 Solutions
Campbell Biology: Custom Edition
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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- Please answer fast Consider a laboratory population that consists entirely of individuals with the same“repulsion” double heterozygous (diploid) genotype, Ab/aB. Assume the rate ofrecombination between the “A” and “B” loci is c = 1/ 4 .a) What are r, s, t and u in this population? What is D?b) What are r, s, t and u after 1 generation of random breeding? What is D?c) What are r, s, t and u after 5 generations of random breeding? What is D?arrow_forward. A gene called Q has two alleles, QFand QG, that encode alternative forms of a red blood cell protein thatallows blood group typing. A different, independentlysegregating gene called R has two alleles, RC and RD,permitting a different kind of blood group typing. Arandom, representative population of football fanswas examined, and on the basis of their blood typing,the following distribution of genotypes was inferred(all genotypes were distributed equally betweenmales and females):QFQFRCRC 202QFQG RCRC 101QGQG RCRC 101QFQFRCRD 372QFQG RCRD 186QGQG RCRD 186QFQFRDRD 166QFQG RDRD 83QGQG RDRD 83This sample contains 1480 fans in total.a. Is the population at Hardy-Weinberg equilibriumwith respect to either or both of the Q andR genes?b. After one generation of random mating within thisgroup, what fraction of the next generation of football fans will be QFQF(independent of their Rgenotype)?c. After one generation of random mating, what fraction of the next generation of football fans will…arrow_forwardQ5. Which of the following is FALSE? If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbA/HbS are protected from malaria, and this is why sickle-cell anemia persists in wetter, mosquito-prone regions in Africa. O In regions where malaria does not occur, individuals who are heterozygous HbA/HbS have a selective advantage over those who are homozygous for the normal hemoglobin allele (HbA).arrow_forward
- If the genotype frequencies in a population are 0.60 AA, 0.20 Aa, and 0.20 aa, and if the requirements of the HardyWeinberg principle apply, the genotype frequencies in the offspring generation will be: a. 0.60 AA, 0.20 Aa, 0.20 aa. b. 0.36 AA, 0.60 Aa, 0.04 aa. c. 0.49 AA, 0.42 Aa, 0.09 aa. d. 0.70 AA, 0.00 Aa, 0.30 aa. e. 0.64 AA, 0.32 Aa, 0.04 aa.arrow_forwardHighlight Draw ソeu र In guinea pigs, short hair is dominant over long hair. If a short haired SS guinea pig is erossed with a long haired ss guinea pig, what are the possible genotypes and phenotypes of their offspring and the percent chance of each? 3. S Fill in the table: Genotype Phenotype Chancearrow_forward2arrow_forward
- Q5.1. Which of the following is FALSE? O If a genetic disease reduces fertility and the allele that causes the disease offers no other advantage, the allele will likely eventually disappear, due to natural selection. Natural selection does not favor individuals who are homozygous for the sickle-cell allele, because these individuals typically die before they are old enough to reproduce. Individuals who are heterozygous HbAlHbS are protected from malaria, and this is why sickle-cell disease persists in wetter, mosquito-prone regions in Africa. O In regions where malaria does not occur, individuals who are heterozygous HbAIHbS have a fitness advantage over those who are homozygous for the normal hemoglobin allele (HbA).arrow_forwardABITI LED aidT 1. In rabbits, coloration of the fur depends on alleles of the gene c. From information given in the chapter, what phenotypes and proportions would be expected from 10loo the following crosses: sonado ort ei terW (A Sbaild ne ved lliw alquoo teal ein a) od 2009 b) to SMAN) antam Sl 126 CC X ccdi ei 18dW (8 Cc x Ceab betoofts Cc x Ccch2 HT YA aud) cccx cc 30 229 Lak 22 mac) VAN i b 115 Srl pres bus mão enisuIP OWT Tarrow_forwardplease answer the blanks for part a and barrow_forward
- 5arrow_forwardSteven Frank and Laurence Hurst argued that a cytoplasmically inherited mutation in humans that has severe effects in males but no effect in females will not be eliminated from a population by natural selection because only females pass on mtDNA (S. A. Frank and L. D. Hurst. 1996. Nature 383:224). Using this argument, explain why males with Leber hereditary optic neuropathy are more severely affected than females.arrow_forwardNonearrow_forward
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