Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 27, Problem 8CONQ
In a population, the frequencies of two alleles are
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A gene for flower color in pea plants has two alleles, A and a. Given the following genotype
frequencies, which of these populations shows evidence of possible inbreeding?
AA-0.38, Aa-0.22, aa-0.40
O AA-0.25, Aa-0.5, aa-0.25
O AA-0.01, Aa-0.18, aa-0,81
O AA-0.12, Aa-0.64, aa-0.24
O AA-0.09, Aa-0.42, aa-0.49
The human MN blood type is determined by two codominant alleles, LMand LN. The frequency of LM in Eskimos on a small Arctic island is0.80.a. If random mating takes place in this population, what are the expectedfrequencies of the M, MN, and N blood types on the island?b. If the inbreeding coefficient for this population is 0.05, what are theexpected frequencies of the M, MN, and N blood types on the island?
In a population of 200 people, an allele F has a frequency of 84%. What is the frequency of allele f? Using the Hardy-Weinberg equation, estimate the numbers of homozygous dominant, heterozygous, and homozygous recessive genotypes. (Remember that the formula is: p2 + 2pq + q2 = 1, where p represents the dominant allele and q represents the recessive allele.) *Be sure to account for all 200 people in the population.
Chapter 27 Solutions
Genetics: Analysis and Principles
Ch. 27.1 - A gene pool is a. all of the genes in a single...Ch. 27.1 - 2. In natural populations, most genes...Ch. 27.1 - A gene exists in two alleles designatedDandd. If...Ch. 27.1 - Prob. 4COMQCh. 27.2 - Which of the following is a factor that, by...Ch. 27.3 - 1. Darwinian fitness is a measure...Ch. 27.3 - 2. Within a particular population, darkly colored...Ch. 27.3 - 3. A population occupies heterogeneous...Ch. 27.3 - Prob. 4COMQCh. 27.4 - 1. Genetic drift is
a. a change in allele...
Ch. 27.4 - 2. Which of the following influences on genetic...Ch. 27.5 - Gene flow depends on a. migration. b. the ability...Ch. 27.6 - 1. Inbreeding is sexual reproduction between...Ch. 27.7 - The mutation rate is a. the likelihood that a new...Ch. 27.7 - 2. The transfer of an antibiotic resistance gene...Ch. 27.7 - Prob. 3COMQCh. 27 - 1. What is the gene pool? How is a gene pool...Ch. 27 - Prob. 2CONQCh. 27 - Prob. 3CONQCh. 27 - Prob. 4CONQCh. 27 - The termpolymorphismcan refer to both genes and...Ch. 27 - Prob. 6CONQCh. 27 - For a gene existing in two alleles, what are the...Ch. 27 - 8. In a population, the frequencies of two...Ch. 27 - The ability to roll your tongue is inherited as a...Ch. 27 - What evolutionary factors can cause allele...Ch. 27 - What is the difference between a neutral and an...Ch. 27 - Prob. 12CONQCh. 27 - Prob. 13CONQCh. 27 - Describe the similarities and differences among...Ch. 27 - 15. Is each of the following examples due to...Ch. 27 - Prob. 16CONQCh. 27 - Prob. 17CONQCh. 27 - 18. A group of four birds flies to a new location...Ch. 27 - 19. Describe what happens to allele frequencies as...Ch. 27 - With regard to genetic drift, are the following...Ch. 27 - When two populations frequently intermix due to...Ch. 27 - Two populations of antelope are separated by a...Ch. 27 - Prob. 23CONQCh. 27 - 24. Using the pedigree shown here, answer the...Ch. 27 - A family pedigree is shown here. A. What is the...Ch. 27 - 26. A family pedigree is shown here.
A. What is...Ch. 27 - Prob. 27CONQCh. 27 - Prob. 28CONQCh. 27 - 1. You will need to be familiar with the...Ch. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 3EQCh. 27 - Prob. 4EQCh. 27 - You will need to refer to question 2 in More...Ch. 27 - Prob. 6EQCh. 27 - Prob. 7EQCh. 27 - In the Grants study of the medium ground finch, do...Ch. 27 - 9. A recessive lethal allele has achieved a...Ch. 27 - Among a large population of 2 million gray...Ch. 27 - In a donor population, the allele frequencies for...Ch. 27 - Prob. 12EQCh. 27 - Prob. 13EQCh. 27 - Prob. 14EQCh. 27 - 15. What would you expect to be the minimum...Ch. 27 - Discuss examples of positive and negative...Ch. 27 - Discuss the role of mutation in the origin of...Ch. 27 - Prob. 3QSDC
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- A mouse mutation with incomplete dominance (t =tailless) causes short tails in heterozygotes (t+/t). Thesame mutation acts as a recessive lethal that causeshomozygotes (t/t) to die in utero. In a populationconsisting of 150 mice, 60 are t+/t+ and 90 areheterozygotes.a. What are the allele frequencies in this population?b. Given that there is random mating among mice, nomigration, and no mutation, and ignoring the effects of random genetic drift, what are the expectednumbers of the different genotypes in this nextgeneration if 200 offspring are born?c. Two populations (called Pop 1 and Pop 2) of micecome into contact and interbreed randomly. Thesepopulations initially are composed of the followingnumbers of wild-type (t+/t+) homozygotes andtailless (t+/t) heterozygotes:Pop 1 Pop 2Wild type 16 48Tailless 48 36What are the frequencies of the two genotypes in thenext generation?arrow_forwardAn autosomal locus has alleles A and a. The allele frequencies in a population at Hardy Weinberg equilibrium are p = Freq(A) = 0.5 q = Freq(a) = 0.5 What is the frequency of homozygous wild-type (AA) in this population? Enter a single number between 0 and 1, for example, 0.33arrow_forwardA total of 1000 members of a Central American population are typed for the ABO blood group. In the sample, 421 have blood type A, 168 have blood type B, 336 have blood type O, and 75 have blood type AB. Part A Use this information to determine the frequency of ABO blood group alleles in the sample. Recall that when considering genes with three alleles whose frequencies are represented by the variables p, q, and r, the sum of genotype frequencies resulting from trinomial expansion is: (p+q+r)² =p² + 2pq+q2+2pr+r²+2gr = 1arrow_forward
- In a population of 500 individuals in Near East, the frequencies of the dominant and recessive alleles for autosomal recessive genetic disease PKU are 0,89 and 0,11 respectively. A is used to indicate the dominant allele, a is used to indicate the recessive allele. Assuming random mating, what are the expected genotype frequencies?arrow_forwardMany recessive traits are very rare in a population, but cystic fibrosis does not follow this pattern. In some populations, the frequency of carriers for cystic fibrosis is 1/35. Does this mean that cystic fibrosis is not more common in inbred mating, such as those between first cousins? Why or why not? Could the frequency of carriers in the general population be a reason that cystic fibrosis is such a common disease? After all, avoiding cousin matings might not help prevent cystic fibrosis in one’s children if unrelated carriers (heterozygotes) are common.arrow_forwardAn autosomal locus has alleles A and a. The allele frequencies in a population at Hardy Weinberg equilibrium are p = Freq(A) = 0.1 q = Freq(a) = 0.9 What is frequency of heterozygotes in this population? Enter a single number between 0 and 1, for example 0.33arrow_forward
- Threatened species often have small, isolated populations where mating between relatives occurs. Let's assume one of these threatened species has a disease controlled by a gene that has two alleles A and a. Only individuals with two copies of the "a" allele have the disease and die before reproducing. Question: What are the effects of inbreeding on the frequency of the "a" allele, and the frequency of the disease in the population?arrow_forwardDoes inbreeding affect allele frequencies? Why or why not? How does it affect genotype frequencies? With regard to rare recessive diseases, what are the consequences of inbreeding in human populations?arrow_forwardIn a large herd of 5468 sheep, 76 animals have yellow fat, and the rest of the members of the herd have white fat. Yellow fat is inherited as a recessive trait. This herd is assumed to be in Hardy-Weinberg equilibrium. A. What are the frequencies of the white and yellow fat alleles in this population? B. Approximately how many sheep with white fat are heterozygous carriers of the yellow allele?arrow_forward
- Imagine you are studying a population of finches on one of the Galápagos Islands. You have been recording many of the birds’ physical traits, including the length of both wings. You observe that for 80% of individuals measured, the length of the left wing is not significantly different from the length of the right wing (in other words, they are symmetrical). But for about 20% of birds measured, the wing lengths are asymmetrical. This distribution is true from generation to generation. Suddenly, a rare 5-day windstorm takes over the island. After the storm, you spend the next several days netting each bird on the island that survived the storm. You discover that 85% of the birds with symmetrical wings survived the storm, whereas only 5% of the birds with asymmetrical wings did. a. Propose a hypothesis to explain this observation. b. If such storms become increasingly common due to changes in climate, how might you expect the population to change over time with respect to wing symmetry?arrow_forwardConsider the following pedigree below for a rare autosomal trait. Be sure to take into account the inbreeding convention, when needed. 1. What is the probability that individual B is heterozygous? 2. What is the inbreeding coefficient of individual E? 3. After divorce, individual “A” decides to marry at random outside the pedigree. If the population allele frequency of the rare autosomal trait is 0.012, what are the chances of having an affected child for his first born of his second marriage?arrow_forward"Natural Selection Is a Major Force Driving Allele Frequency Change". Explain how ?arrow_forward
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