GENETIC ANALYSIS: AN INTEG. APP. W/MAS
2nd Edition
ISBN: 9781323142790
Author: Sanders
Publisher: Pearson Custom Publishing
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Chapter 22, Problem 11P
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A population sample of 300 individuals is studied for the electrophoretic mobility of an enzyme that varies according to the genotype determined by 2 alleles, E and T of a single gene. The results are 7 individuals with genotype EE, 106 with genotype ET, and 187 with genotype TT. What are the allele frequencies of E and T, and what are the expected numbers of the 3 genotypes if random mating is assumed?
The following data for the genotypes at the alcohol dehydrogenase locus were
observed from a sample of Drosophila melanogaster.
Sample size
1000
FF
550
FF=0.55; FS=0.34; SS=0.11
O F-0.72; S=0.28
FF=0.078; FS=0.40; SS=0.52
FS
What are the Hardy-Weinberg equilibrium genotype frequencies for each genotype
based upon this sample?
OFF=0.52; FS=0.40; SS=0.078
340
SS
110
Propose a hypotheses for this observation:
In a study conducted by an undergraduate student, he obtained data showing that approximately 75% of the European Northern human population demonstrate the expression of a phenotype directly associated with the homozygous dominant genotype, while 25% display the mutant phenotype despite their genotypes being homozygous dominant.
Chapter 22 Solutions
GENETIC ANALYSIS: AN INTEG. APP. W/MAS
Ch. 22 - 20.1 Compare and contrast the terms in each of the...Ch. 22 - In a population, what is the consequence of...Ch. 22 - 20.3 Identify and describe the evolutionary forces...Ch. 22 - Describe how natural selection can produce...Ch. 22 - Thinking creatively about evolutionary mechanisms,...Ch. 22 - 20.6 Genetic drift, an evolutionary process...Ch. 22 - Over the course of many generations in a small...Ch. 22 - Catastrophic events such as loss of habitat,...Ch. 22 - 20.9 George Udny Yule was wrong in suggesting that...Ch. 22 - 20.10 The ability to taste the bitter compound...
Ch. 22 - Figure 20.6 illustrates the effect of an ethanol ...Ch. 22 - 20.12 Biologists have proposed that the use of...Ch. 22 - 20.13 Two populations of deer, one of them large...Ch. 22 - 20.14 Directional selection presents an apparent...Ch. 22 - 20.15 What is inbreeding depression? Why is...Ch. 22 - 20.16 Certain animal species, such as the...Ch. 22 - Genetic Analysis 20.1 predicts the number of...Ch. 22 - 20.18 In a population of rabbits, and . The...Ch. 22 - Sickle cell disease (SCD) is found in numerous...Ch. 22 - 20.20 Epidemiologic data on the population in the...Ch. 22 - The frequency of tasters and nontasters of PTC...Ch. 22 - Tay-Sachs disease is an autosomal recessive...Ch. 22 - 20.23 Cystic fibrosis (CF) is the most common...Ch. 22 - 20.24 In the mouse, Mus musculus, survival in...Ch. 22 - 20.25 In a population of flowers growing in a...Ch. 22 - Assume that the flower population described in the...Ch. 22 - 20.27 ABO blood type is examined in a Taiwanese...Ch. 22 - 20.28 A total ofmembers of a Central American...Ch. 22 - 20.29 A sample offield mice contains individuals...Ch. 22 - Prob. 30PCh. 22 - Albinism, an autosomal recessive trait...Ch. 22 - Prob. 32PCh. 22 - 20.33 Evaluate the following pedigree, and answer...Ch. 22 - Evaluate the following pedigree, and answer the...Ch. 22 - The following is a partial pedigree of the British...Ch. 22 - Draw a separate hypothetical pedigree identifying...Ch. 22 - Prob. 37PCh. 22 - 20.38 Achromatopsia is a rare autosomal recessive...Ch. 22 - 20.39 New allopolyploid plant species can arise by...
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- In a study of the alcohol dehydrogenase (ADH) enzyme in a population of Drosophila melanogaster, a researcher finds the following allele frequencies for the Fast (F) and Slow (S) alleles of the gene: FF=0.81, FS=0.18, SS=0.01. What is the allele frequency of the F allele?arrow_forwardEach graph below depicts reaction norms for three different genotypes reared in different environments. In which case(s) is/are VE> 0 (you can assume that graphs for parents and their offspring would be the same)? Mark all that apply Mean phenotype (a) (c) graph a graph b graph c graph d (b) (d) Environmentarrow_forwardA dominant mutation in Drosophila called Delta causes changes in wing morphology in Delta/Delta+ heterozygotes. Homozygosity for mutant alleles (Delta/Delta) is lethal prior to the adult stage. In a population of 150 adult flies, it was determined that 60 had normal wings and 90 had abnormal wings. What is the frequency of the mutant Delta allele in this population?arrow_forward
- Honey bee workers from a colony in North Carolina are visiting two food sites, A and B, at 6 am as shown below. Site A is 1500 m from the hive; site B is 300 m from the hive. Which of the following statements is true regarding the genetic basis of the bees’ ability to track the passage of time and compensate for the movement of the sun? a. The bees’ clock mechanism is based on the Amfor gene, which causes a build up of AMFOR protein in the corpora pedunculata that activates the Gp9 and UU genes, whose products degrade AMFOR in a 24 hour cycle. b. The bees’ clock mechanism is based on the per gene in the optic lobes, whose activity has a 24 hour cycle regulated by the dbt and tim genes. c. The bees’ clock mechanism is based on alternating expression of two alleles for the for gene in the subesophagael ganglion: the R allele which is active at night and the s allele which is active during the day. d. The bees’ clock mechanism is based on levels of eclosion hormone released from…arrow_forwardIn a study conducted by an undergraduate student, Simran obtained data showing that approximately 75% of the European Northern human population demonstrate the expression of a phenotype directly associated with the homozygous dominant genotype, while 25% display the mutant phenotype despite their genotypes being homozygous dominant. Propose two hypotheses for this observation.arrow_forwardTwo alleles have been found at the X-linked phosphoglucomutase gene (Pgm) in a Drosophila persimilis population in California. The frequency of the PgmA allele is 0.3, while the frequency of the PgmB allele is 0.7. Assuming the population is at Hardy- Weinberg equilibrium, what are the expected genotype frequencies in males and females?arrow_forward
- Students in a genetics laboratory began an experiment in an attempt to increase heat tolerance in two strains of Drosophila melanogaster. One strain was trapped from the wild six weeks before the experiment was to begin; the other was obtained from a Drosophila repository at a university laboratory. In which strain would you expect to see the most rapid and extensive response to heat-tolerance selection, and why?arrow_forwardIn Drosophila melanogaster, wing shape is an autosomal trait. Vestigal wing is recessive (v) to the dominant trait for the normal long wings (V). In a mainland source population, the allele frequency of v is 0.02 . A small, experimental population of 100 flies was introduced on an island and had 20 flies with vestigal wings and 40 heterozygotes. What are the allele frequencies of V and v in this introduced population? What proportion (%) of heterozygotes and homozygous recessive flies would you expect to see after a few generations of mating on this island? What phenomenon of population genetics does this experiment demonstrate? p+q=1, p^2 + 2pq + q^2 = 1arrow_forwardIn the fly speciation experiment described in class, Drosophila from a single culture was split into four isolated cultures, 2 raised on maltose food and two on starch food. After forty generations all possible crosses were done between maltose and starch flies and between the two starch populations. Flies from different food types had very low mating frequencies compared to flies from the same food type but flies from different starch populations only mated at a very slightly lower rate than flies from the same starch population. How would you interpret this finding? Group of answer choices A. allopatric speciation is more powerful than sympatric speciation B. flies are incapable of evolution C. drift causes divergence more rapidly than selection D. sympatric speciation is more powerful than allopatric speciation E. selection causes divergence more rapidly than driftarrow_forward
- Do the data in Figure 26.13 support the predictions of the neutralmutationhypothesis, or do they suggest that balancing selection isoccurring? Explain your reasoning.arrow_forwardplease tell us the expected average time to fixation of an allele at frequency p = 0.5 in a population of 100 individuals, we can safely assume that the allele does become fixed?arrow_forwardYou 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?arrow_forward
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