B) A particular allele, A1, is fixed (100% frequency) in a population of humans living on an island. The frequency of A1 is 8% in mainland populations. Both genetic drift and selection can fix alleles. Describe one way you might be able to tell if the A1 allele has been fixed by selection or by drift

B) A particular allele, A1, is fixed (100% frequency) in a population of humans living on an island. The frequency of A1 is 8% in mainland populations. Both genetic drift and selection can fix alleles. Describe one way you might be able to tell if the A1 allele has been fixed by selection or by drift

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 2QP: How Can We Measure Allele Frequencies in Populations? The MN blood group is a single-gene,...

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A recessive lethal allele has achieved a frequency of 0.22 due to genetic drift in a very small population. Based on natural selection, how would you expect the allele frequencies to change in the next three generations? Now: Your calculation can assume that genetic drift is not altering allele frequencies in either direction.
A recessive lethal allele has achieved a frequency of 0.22 due to genetic drift in a very small population. Based on natural selection, how would you expect the allele frequencies to change in the next three generations? (Note: Your calculation can assume that genetic drift is not altering allele frequencies in either direction.)
Which of the following statements most accurately describes the effects of genetic drift on a population? a. Populations of the same size will follow the same evolutionary trajectory when evolving due to drift. b. Genetic drift has the potential to drive evolution in all populations. c. Allele frequencies in a population of infinite size will ultimately drift to fixation or loss. d. The loss of otters in California due to excessive hunting cause a founder effect.
With regard to genetic drift, are the following statements true or false? If a statement is false, explain why. A. Over the long run, genetic drift leads to allele fixation or loss. B. When a new mutation occurs within a population, genetic drift is more likely to cause the loss of the new allele rather than the fixation of the new allele. C. Genetic drift promotes genetic diversity in large populations. D. Genetic drift is more significant in small populations.
Let’s suppose the mutation rate for converting a B allele into a b allele is 10–4. The current allele frequencies are B = 0.6 and b = 0.4. How long will it take for the allele frequencies to equal each other, assuming that no genetic drift takes place?
There are five generations of complete selection against recessive individuals (a) , migration (b), and random genetic drift (c). that affect the gene (A, a) and genotypic (AA, Aa, aa) frequencies of the population. Afterward, answer the question that follows. Based on the figures, what are the effect of complete selection, migration, and random genetic drift on the gene and genotypic frequencies of the population? Describe the trend for each scenario and provide a brief explanation. a. complete selection against recessive individuals b. migration c. random genetic drift (random mating in a very small population)
Which of the following statements describes an example of genetic drift?a. Allele g for fat production increases in a small population because birds with more bodyfat have higher survivorship in a harsh winter.b. Random mutation increases the frequency of allele A in one population but not inanother.c. Allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. Allele m is lost when a virus kills all but a few individuals and just by chance, none ofthe survivors possess allele m.
A group of four birds flies to a new location and initiates a new colony. Three of the birds are homozygous AA, and one bird is heterozygous Aa. A. What is the probability that the a allele will become fixed in the population via genetic drift? B. If fixation of the a allele occurs, how long will it take? C. How will the growth of the population, from generation to generation, affect the answers to parts A and B? Explain.
How does population size affect the likelihood of changes in allele frequencies by chance alone? Can significant changes in allele frequencies (that is, evolution) occur as a result of genetic drift?
Which of the following is an example of genetic drift? Group of answer choices A-As global temperatures increase, alleles that confer resistance to heat become more prevalent B-Peter Parker gets irradiated and turns into Spider Man C-The American Bison was hunted almost to extinction very quickly, and only a few remained D-5% of your neighborhood moves to Canad
If gene A/a is not in Hardy-Weinberg equilibrium due to natural selection such that individuals with the genotype AA have a fitness value of 1.0, heterozygotes have only slightly reduced fitness at 0.9, and individuals with the genotype aa have a fitness value of 0.6, what kind of change in allele frequency would you expect to see over time assuming you start with equal frequencies of the 2 alleles?
Antibiotics are commonly used to combat bacterial and fungal infections. During the past several decades, however, antibioticresistant strains of microorganisms have become alarmingly prevalent. This has undermined the effectiveness of antibiotics in treating many types of infectious disease. Discuss how the following processes that alter allele frequencies may have contributed to the emergence of antibiotic-resistant strains: A. Random mutation B. Genetic drift C. Natural selection