For each of the following scenarios, decide whether a change in allele frequencies is more likely to be caused by genetic drift or by selection: a) A small group of spiders move to a new forest [ Select ] b) Only insects that are resistant to a pesticide survive in a farmer's field [ Select ] c) Bark beetles kill trees with weakened immune systems [ Select ] d) A den of foxes is destroyed when the land is cleared for agriculture [Select ] e) The slowest pigeons do not survive attacks by peregrine falcons [ Select] f) Only a few lizards are left on an meadow after a severe storm [ Select ]

For each of the following scenarios, decide whether a change in allele frequencies is more likely to be caused by genetic drift or by selection: a) A small group of spiders move to a new forest [ Select ] b) Only insects that are resistant to a pesticide survive in a farmer's field [ Select ] c) Bark beetles kill trees with weakened immune systems [ Select ] d) A den of foxes is destroyed when the land is cleared for agriculture [Select ] e) The slowest pigeons do not survive attacks by peregrine falcons [ Select] f) Only a few lizards are left on an meadow after a severe storm [ Select ]

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 7QP: How Can We Measure Allele Frequencies in Populations? Drawing on your newly acquired understanding...

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Why is genetic drift more significant in small populations? Why does it take longer for genetic drift to cause allele fixation in large populations than in small ones?
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Consider the first copy of an allele for insecticideresistance that arises by mutation in a populationof insects exposed to an insecticide. Is this mutation an adaptation? If, after some generations,we find that most of the population is resistant,is the resistance an adaptation? If we discovergenetic variation for insecticide resistance in apopulation that has had no experience of insecticides, is the variation an adaptation? If an insectpopulation is polymorphic for two alleles, eachof which confers resistance against one of twopesticides that are alternately applied, is thevariation an adaptation? Or is each of the tworesistance traits an adaptation?
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A hypothetical population of 10,000 humans has 6848 individuals with the blood type AA, 2846 individuals with blood type AB, and 306 individuals with the blood type BB. What is the frequency of each genotype in this population? What is the frequency of the A allele? What is the frequency of the B allele? If the next generation contained 25,000 individuals, how many individuals would have blood type BB, assuming the population is in Hardy-Weinberg equilibrium?
How Can We Measure Allele Frequencies in Populations? Drawing on your newly acquired understanding of the HardyWeinberg equilibrium law, point out why the following statement is erroneous: Because most of the people in Sweden have blond hair and blue eyes, the genes for blond hair and blue eyes must be dominant in that population.
You observe a population of mice with 100 individuals. Brown fur is dominant to white fur. You count 80 brown mice and 20 white mice. What is the frequency of the dominant allele? (Answers rounded to 2 decimal places) You observe a population of mice with 100 individuals. Brown fur is dominant to white fur. You count 80 brown mice and 20 white mice. What is the frequency of the recessive allele? (Answers rounded to 2 decimal places) You observe a population of mice with 100 individuals. Brown fur is dominant to white fur. You count 80 brown mice and 20 white mice. What is the frequency of the homozygous dominant genotype? (Answers rounded to 2 decimal places) You observe a population of mice with 100 individuals. Brown fur is dominant to white fur. You count 80 brown mice and 20 white mice. What is the frequency of the homozygous recessive genotype? (Answers rounded to 2 decimal places) You observe a population of mice with 100 individuals. Brown fur is dominant to white fur. You count…
If the frequency of an allele at a locus of interest is 0.57, and we know there are only two alleles at this locus, what must be the frequency of the other allele?
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In a population that meets the Hardy–Weinberg equilibrium assumptions, 81% of the individuals are homozygous for a recessive allele. What percentage of the individuals would be expected to be heterozygous for this locus in the next generation?