Selection operates on a trait with a normal distribution. If after selection, the mean in the trait has not changed, but the frequency In the trait has increased at the extremes, of: O disruptive (or diversifying) selection O directional selection O stabilizing selection O frequency-dependent selection

Selection operates on a trait with a normal distribution. If after selection, the mean in the trait has not changed, but the frequency In the trait has increased at the extremes, of: O disruptive (or diversifying) selection O directional selection O stabilizing selection O frequency-dependent selection

Name: Selection operates on a trait with a normal distribution. If after se
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Description: Selection operates on a trait with a normal distribution. If after selection, the mean in the trait has not changed, but the frequency In the trait has increased at the extremes,of:O disruptive (or diversifying) selectionO directional selectionO sta

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter19: Evolutionary Change In Populations

Section: Chapter Questions

Problem 4TYU: If a populations allele and genotype frequencies remain constant from generation to generation, (a)...

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The relative fitnesses of A1A1, A1A2, and A2A2 are 0.5,0.8 and 1 respectively. What is the expected result of natural selection in this selection? a.) A1 will increase and A2 will decrease. b.) A2 will increase and A1 will decrease. c. Both alleles will decrease in frequency d.) A stable equilibrium will be achieved in which both alleles are maintained e.) An unstable equilibrium will exist and the outcome depends on the allele frequencies.
Present the name of the population undergoing natural selection and its selection pressure (e.g., what is causing the change in the population's alleles); the nature of the change and its implications of that change for the population.
Which of the following is NOT true of stabilising selection a. it occurs when inidivuals with extreme trait values have lower fitness than those with intermediate trait values. b. it keeps the mean close (or moves it closer) to the optimum value c. it can result from opposing directional selection, such as when early flowering makes flowers susceptible to herbivores, but late flowering reduces the availability of pollinators. d. it does not improve the fitness of the population to the environment. e. it decreases the range of variation in the population
If a relative fitness value is w=0.4, what is the selection coeffcient used to identify the differences between the fitness of organisms wiht different traits?
Which of the following is likely to be observed if there has been a strong positive selection on a particular genetic locus within a population? Group of answer choices There will be a lot of variation in DNA surrounding the genetic locus in question within the population. There will very little variation in DNA surrounding the genetic locus in question within the population. You will see very low frequencies of the genetic locus in question
One way for disruptive selection to occur is ifa. the population contains diversity.b. the environment contains diversity.c. pollution is present.d. natural selection occurs.e. All of these are correct.
In the following form of selection, one extreme of a variable character is selected for: Directional Selection Stabilizing Selection Disruptive Selection
Explain how negative frequency-dependent selection works.
Which of the following types of selection maintain variation in a population? a. Overdominance (Heterozygote advantage) b. Underdominance (Heterozygote disadvantage) c. Frequency-dependent selection d. Directional selection e. Both a. & b. f. Both a. and c. g. Both a. and d.
Which of the following contribute to keeping low-fitness alleles in our gene pool? Choose all that are correct a) Random mating b) New mutations c) Inefficient selection against rare recessive disease-causing alleles d) Late age of onset of some diseases e) Efficient selection against rare recessive disease-causing alleles
Consider a hypothetical beetle population, in which beetle colour variesalong a spectrum from light to dark green. When introduced to anenvironment characterized by light green moss and dark green shrubs,both light and dark green beetles have higher fitness than medium greenbeetles. Which of the following terms best describes this situation? Select one:O a. Stabilizing selectionO b. Directional selectionO c. Disruptive selectionO d. Sexual selection
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 heterozygotes