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 5RQ
Population genetics is the study of:
- how selective forces change the allele frequencies in a population over time
- the genetic basis of population-wide traits
- whether traits have a genetic basis
- the degree of inbreeding in a population
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Students have asked these similar questions
The Hardy-Weinberg principle states that, in a large population, the proportion of each allele will do which of the following if there are no environmental forces on the population?
increase for recessive alleles
decrease for dominant alleles
remain the same
increase for dominant alleles
According 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 mating
The Hardy-Weinberg principle states that allele and genotype frequencies remain constant from one generation to the next, as long as specific conditions are met.
Choose Yes or No for the conditions that must be met from the providied statement below.
1. Mutations are exponentially occuring
2. All member of the population breed
3. Everyone produces the same number of offspring
4. The population is infinitely large
5. There is no migration in or out of the population
6. No net mutations are occuring
7. Natural selection of beneficial traits is occuring
8. Natural selection is not occuring
9. All mating is completely random
10. Offspring are able to migrate out of the population
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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- A population consists of 100 individuals of the following genotypes: AA 55 Aa 20 0.14 0.2 0.25 0.35 0.55 0.65 0.75 0.8 aa 25 What is the frequency of the A allele?arrow_forwardWhat does it mean that an allele increases an organism's fitness? Choose one of the following: it increases the likelihood of that organism surviving and reproducing in their current environment it increases the health and strength of the organism it increases the likelihood of that organism surviving and reproducing in ANY environmentarrow_forwardWhich of the following statements about genetic drift is correct? Genetic drift causes predictable fluctuations in allele frequencies from one generation to the next and increases genetic variation within populations. Genetic drift causes predictable fluctuations in allele frequencies from one generation to the next and reduces genetic variation within populations. Genetic drift causes unpredictable fluctuations in allele frequencies from one generation to the next and does not affect genetic variation within populations. Genetic drift causes predictable fluctuations in allele frequencies from one generation to the next and do not affect genetic variation within populations. ) Genetic drift causes unpredictable fluctuations in allele frequencies from one generation to the next and tend to reduce genetic variation within populations.arrow_forward
- If there are two alleles in a population, and the frequency of one is 0.25, what is the frequency of the other allele? 25% 50% 30% 75%arrow_forwardThere are particular factors that cause the diversity in a gene pool to change. For each of the following statements, select the correct factor from the menu on the attached picture that is being described. The process by which organisms with certain heritable traits survive, passing on their traits to the next generation; determined by the environmental conditions of the time A change in allele frequencies caused by chance events in a small gene pool The movement of alleles into or out of a population by immigration or emigration The process of choosing mates based on the presence of certain traits or phenotypes and, thus, genotypes; traits are usually displayed in some form of courtship ritual A type of genetic drift that occurs when a natural disaster thins the population to a small group that happens to be unrepresentative of the original group; allele frequencies of the two groups will be dissimilar A type of genetic drift that occurs when a small population that is not…arrow_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
- What is the probability of fixation of a gene in a population of 30 individuals (assume no selection for or against a mutation)? Multiple Choice 3.3% 3% 1.6% 0.16%arrow_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_forwardA trait with only two forms in the population, wild type and mutant, would exhibit which one of the following types of genetic variation in the population? Continuous Discontinuous Both continuous and discontinuous Neither continuous nor discontinuousarrow_forward
- You sample the frequency of an allele in a population over 12 consecutive generations and find that the frequency of the allele changes as follows: Generation 1 2 3 4 5 6 7 8 9 10 11 12 Frequency 0.75 0.73 0.72 0.71 0.70 0.69 0.67 0.66 0.65 0.64 0.62 0.61 How would you best characterize this allele and this population? A. The allele is under selection and the population size is very small B. The allele is under selection and the population size is very large C. The allele is not under selection and the population size is very small D. The allele is not under selection and the population size is very largearrow_forwardA scientist is studying a wild population of Japanese morning glories. It is easy to separate genotypes at a flower color locus by their phenotypes. Red individuals are homozygous for the R allele, yellow individuals are homozygous for the Y allele, and orange individuals are heterozygous. If the number of individuals with the following genotypes are: RR: 831 RY: 33 YY: 442 Is the population in Hardy Weinberg Equilibrium?arrow_forwardThe table below records information on a gene with two alleles, Z and Y, in four different populations. Use this information to answer the following questions. Based on the table, which of the following statements is true? Population Frequency of allele Z Population size Fitness of ZZ Fitness of ZY Fitness of YY A 1.0 200 0.84 0.84 1.0 B 0 320,000 0.84 0.84 1.0 C 0.93 130,000 0.84 0.84 1.0 D 0.99 1,450,000 1.0 1.0 0.62 A.) populations C's allele frequencies are mainly driven by genetic drift B.) Mutation rates are high in population D C.) natural selection is favoring allele A in population C D.) migration is occuring between populations C and Darrow_forward
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