EBK BIOLOGY
10th Edition
ISBN: 8220100474729
Author: Martin
Publisher: Cengage Learning US
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Textbook Question
Chapter 19, Problem 11TYU
If all copies of a given locus have the same allele throughout the population, the allele frequency is (a) 0 (b) 0.1 (c) 0.5 (d) 1.0 (e) 10.0
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A mountain region has a population of 5,000 mountain goats. You score these animals for the R locus and find that this locus has two alleles, R (dominant) and r (recessive). 3200 individuals are homozygous dominant, 1,600 are heterozygous, and 200 are homozygous recessive.
a) Calculate the allele frequencies for this population. Show your work.
b) Calculate the observed genotypic frequencies for this population. Show your work.
c) Calculate the expected genotype frequencies if the population is in Hardy-Weinberg equilibrium. Show your work.
d) Does this population appear to be at H-W equilibrium? Why or why not? (You do not need to analyze this statistically).
A population consists of 7 mice. For the coat color trait, there are only two alleles: brown (B) and white
(b). BB and Bb mice are brown; bb mice are white. In the population's gene pool, there are 7 white
alleles (b).
a) What is the frequency of the brown allele in the population? Select)
b) What do you predict the frequency of the bb genotype will be in the next generation if no evolution
takes place in the population? I Select |
c) The mice live on dark black, volcanic rocks in the Arizona desert and two hawks are introduced into
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reintroduction and find the following numbers: 24 BB mice, 52 Bb mice, 24 bb mice. Has natural
selection by the hawks caused the population to evolve significantly? I Select]
(1 point) Humans with the genotypes DD and Dd show the Rh+ blood phenotype, whereas those with the genotype dd show the Rh- blood phenotype. In a sample of 400 Basques from Spain, 230 people were Rh+ and 170 people were Rh-. Assuming that this population is in Hardy-Weinberg proportions, what is the allele frequency of the allele D?
(a) (a) 0.348 (answer)
(b) (b) 0.652
(c) (c) 0.425
(d) (d) 0.575
(e) (e) 0.288
2. (2 points) In the Basque population mentioned above, what proportion of the Rh+ individuals would be expected to be heterozygote?
(a) (a) 0.454
(b) (b) 0.789 (answer)
(c) (c) 0.516
(d) (d) 0.250
(e) (e) 0.500
How is the answer for #2, b? please explain
Chapter 19 Solutions
EBK BIOLOGY
Ch. 19.1 - Define what is meant by a populations gene pool.Ch. 19.1 - Distinguish among genotype, phenotype, and allele...Ch. 19.1 - Prob. 1CCh. 19.1 - Can the frequencies of all genotypes in a...Ch. 19.1 - INTERPRET DATA In a human population of 1000, 840...Ch. 19.2 - Discuss the significance of the HardyWeinberg...Ch. 19.2 - Prob. 4LOCh. 19.2 - INTERPRET DATA In a population at genetic...Ch. 19.2 - INTERPRET DATA In a population at genetic...Ch. 19.2 - INTERPRET DATA The genotype frequencies of a...
Ch. 19.3 - Prob. 5LOCh. 19.3 - Discuss how each of the following...Ch. 19.3 - Distinguish among stabilizing selection,...Ch. 19.3 - Which microevolutionary force leads to adaptive...Ch. 19.3 - Why is mutation important to evolution if it is...Ch. 19.3 - Which microevolutionary forces are most associated...Ch. 19.3 - Prob. 4CCh. 19.4 - Prob. 8LOCh. 19.4 - Prob. 1CCh. 19.4 - Prob. 2CCh. 19.4 - How can researchers test the hypothesis that...Ch. 19 - The genetic description of an individual is its...Ch. 19 - In a diploid species, each individual possesses...Ch. 19 - The MN blood group is of interest to population...Ch. 19 - If a populations allele and genotype frequencies...Ch. 19 - Prob. 5TYUCh. 19 - The continued presence of the allele that causes...Ch. 19 - According to the HardyWeinberg principle, (a)...Ch. 19 - Prob. 8TYUCh. 19 - Mutation (a) leads to adaptive evolutionary change...Ch. 19 - Which of the following is not true of natural...Ch. 19 - If all copies of a given locus have the same...Ch. 19 - Prob. 12TYUCh. 19 - EVOLUTION LINK Given that mutations are almost...Ch. 19 - Prob. 14TYUCh. 19 - Prob. 15TYUCh. 19 - EVOLUTION LINK Evolution is sometimes...Ch. 19 - INTERPRET DATA The recessive allele that causes...Ch. 19 - PREDICT You study males in populations of a...Ch. 19 - Prob. 19TYU
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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? [ Select ] d) Is this beetle population evolving? I Select ]arrow_forwardThe frequency of two alleles in a gene pool is 0.24 (A) and 0.76 (a). Assume that the population is in Hardy-Weinberg equilibrium. a) Calculate the percentage of heterozygous individuals in the population. Enter your response rounded to two decimal places, do not include % sign. b) Calculate the percentage of homozygous recessive individuals in the population. Enter your response rounded to two decimal places, do not include % sign.arrow_forwardA sample of 100 individuals from a population that is dimorphic at the A locus has genotype counts as follows. AA: 30 Aa: 60 aa: 10 a) What are the allele frequencies in the population? b) What are the expected genotype frequencies, if the population were at HardyWeinberg equilibrium? c) Is the proportion of heterozygotes lower or higher than expected at Hardy-Weinberg equilibrium? What deviations from the assumptions of the model would best explain the observed difference?arrow_forward
- A laboratory in British Columbia, the Kelatavicla lab, starts a mouse population where the frequency of the R allele is 0.5. You maintain this population for many years under the conditions found in column A. Given the information in the table (column A) and the information above it, predict what you think will happen to the frequency of the R allele. A) The frequency of the R allele will remain stable. B) The frequency of the R allele will increase. C) The frequency of the R allele will decrease.arrow_forwardCan you please help find the frequencies of A and a? Please show how to approach this problem.arrow_forwardA population of squirrels has two fur color alleles: the dominant allele (B) for black fur and the recessive allele (b) for brown fur. In a sample of 100 squirrels, 25 have black fur and are homozygous dominant (BB), 50 have black fur and are heterozygous (Bb), and 25 have brown fur (bb). Based on these numbers, what is the allele frequency for B and b? Are these genotype frequencies the same as you would expect if no evolution was occurring and genotypes were "picked at random" from the population gene poll of alleles? B = 25%; yes the same as you would expect as if genotypes were picked at random. B = 50%; yes the same as you would expect as if genotypes were picked at random. B = 75%; yes the same as you would expect as genotypes were picked at random. B = 25%; no, not the same as you would expect as if genotypes were picked at random. There's probably active evolutionary change happening B = 50%; no, not the same as you would expect as if genotypes were picked at random. There's…arrow_forward
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