Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 19, Problem 8RQ
When male lions reach sexual maturity, they leave their group in search of a new pride. This can alter the allele frequencies of the population through which of the following mechanisms?
- natural selection
- genetic drift
- gene flow
- random mating
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Select all of the processes that can cause changes in allele frequencies.
gene flow
large population size
genetic drift
natural selection
mutation
When male lions reach sexual maturity, they leave their pride in search of a new pride. Mating with females in the new pride can change the allele frequencies in the population through which of the following mechanisms?
When a population is at Hardy-Weinberg equilibrium which one of the following is true?
Group of answer choices
Genotypic frequencies change generation after generation.
One can calculate the recessive allele frequency directly from the number of homozygous recessive phenotypes seen.
Individuals of the same genotype are most likely to mate.
Allele frequencies change generation after generation.
Chapter 19 Solutions
Biology 2e
Ch. 19 - Figure 19.2 In plants, violet flower color (V) is...Ch. 19 - Figure 19.4 Do you think genetic drift would...Ch. 19 - Figure 19.8 In recent years, factories have become...Ch. 19 - What is the difference between micro- and...Ch. 19 - Population genetics is the study of: how selective...Ch. 19 - Which of the following populations is not in...Ch. 19 - One of the original Amish colonies rose from a...Ch. 19 - When male lions reach sexual maturity, they leave...Ch. 19 - Which of the following evolutionary forces can...Ch. 19 - What is assortative mating? when individuals mate...
Ch. 19 - When closely related individuals mate with each...Ch. 19 - What is a cline? the slope of a mountain where a...Ch. 19 - Which type of selection results in greater genetic...Ch. 19 - When males and females of a population look or act...Ch. 19 - The good genes hypothesis is a theory that...Ch. 19 - Solve for the genetic structure of a population...Ch. 19 - Explain the Hardy-Weinberg principle of...Ch. 19 - Imagine you are trying to test whether a...Ch. 19 - Describe a situation in which a population would...Ch. 19 - Describe natural selection and give an example of...Ch. 19 - Explain what a cline is and provide examples.Ch. 19 - Give an example of a trait that may have evolved...Ch. 19 - List the ways in which evolution can affect...
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- Which of the following is a TRUE statement? Non-random mating will increase the number of heterozygotes. Genetic drift within a population will increase genetic variation. Migration into the population will decrease genetic variation. Mutation will decrease genetic variation. Stabilizing selection will increase genetic variation.arrow_forwardAccording to the principle of Hardy-Weinberg, which of the following will NOT change the frequencies of genotypes in a population? Select one: Genetic drift Natural selection Mutation Random matingarrow_forwardOne of the dangers faced by a bottlenecked population is: Loss of genetic diversity and increased inbreeding Random changes in allele frequencies Gene flow Too much genetic diversityarrow_forward
- Which of the following statements about genetic fitness and/or selection is false? Group of answer choices Individuals with low fitness have greater selection coefficients Fitness involves both relative viability and reproductive success Individuals with high fitness have greater selection coefficients Selection against recessive alleles tends to be slower overall than dominant alleles because of the survival in heterozygotesarrow_forwardWhich of the following is not true for a critically endangered species? Expression of deleterious alleles and increased homozygosity increases mortality of young, and inbreeding depression leads to reduced offspring fitness The individuals of the species which have declined to low numbers are still a genetically open system Loss of some allele from the species causing loss of genetic diversity with consequent inability to respond rapidly to selection Reduction of population breeding ability due to increased relatedness through the action of incompatibility mechanisms in plants or behavioural difficulties in animalsarrow_forwardIf 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) 10.0arrow_forward
- Which one of the following would be considered an example of sexual selection? Similar death rates due to disease in both sexes of a species The presence of both male and female reproductive structures within each individual of a species Longer tailed males of a bird species mating more frequently on average than shorter tailed males of the same species Higher offspring survival in individuals homozygous for one type of allele compared to individuals homozygous for a different allele at the same locus The ability of a species to utilize either asexual or sexual reproductionarrow_forwardIf both the forces of mutation and natural selection are acting on this population from generation to generation (and have been acting on this population for many many generations), what do you predict will happen to allele frequencies over successive generations? Allele frequencies will remain constant The frequency of the D allele will increase The frequency of the d allele will increasearrow_forwardIt is estimated that every human carries at least one recessive lethal allele (i.e. they are heterozygotes at that locus). What maintains these alleles in populations given their lethality when homozygous? Group of answer choices heterozygote disadvantage mutation/selection balance inbreeding genetic driftarrow_forward
- In a population of rabbits, half of the rabbits are brown and half are grey. Because male and female rabbits prefer to mate with only brown rabbits, eventually the population ends up with about 90% of the rabbits being brown. We can say that: grey rabbits will go extinct soon. no evolution has occurred because the change in allele frequencies is due to mating preference. evolution by non-random mating (or sexual selection) has occurred. evolution by natural selection has occurred.arrow_forwardThe equilibrium frequency of a deleterious allele under mutation-selection balance increases as: mutation rate increases strength of selection increases dominance increases none of the abovearrow_forwardGodfrey Hardy and Wilhelm Weinberg stated the principle of equilibrium to describe the genetic makeup of a population. The theory, also known as the Hardy-Weinberg principle of equilibrium, states that a population’s allele and genotype frequencies are inherently stable. Which of the following phenomena could disrupt this equilibrium? Mutations Selection pressure Migration All of the given choicesarrow_forward
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