People with two copies of the sickle cell gene are often quite ill with sickle cell anemia, while those with two copies of normal hemoglobin are likely tobecome quite ill with malaria where it occurs. Heterozygotes suffer few effects of sickle cell anemia, and are considerably resistant to malaria. In areaswhere malaria occurs, it exertson the human population.O A. Directional selectionO B. Disruptive selectionO C. Bimodal selectionO D.Stabilizing selectionO E. None of the above«< Question 20 of 120A Moving to another question will save this response.12:0112/16/26.PgUpPgDnF12PrtScnF8HomeF9EndF10F11DIIF5F7F6F4F3&#378.9.3YUR近

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Description: People with two copies of the sickle cell gene are often quite ill with sickle cell anemia, while those with two copies of normal hemoglobin are likely tobecome quite ill with malaria where it occurs. Heterozygotes suffer few effects of sickle cell

Sickle cell disease is a hereditary disease which affects the hemoglobin molecules.It was first…

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Biology

People with two copies of the sickle cell gene are often quite ill with sickle cell anemia, while those with two copies of normal hemoglobin are likely t become quite ill with malaria where it occurs. Heterozygotes suffer few effects of sickle cell anemia, and are considerably resistant to malaria. In are- where malaria occurs, it exerts on the human population. O A. Directional selection O B. Disruptive selection O C. Bimodal selection O D.Stabilizing selection O E. None of the above K Question 20 of 120

People with two copies of the sickle cell gene are often quite ill with sickle cell anemia, while those with two copies of normal hemoglobin are likely t become quite ill with malaria where it occurs. Heterozygotes suffer few effects of sickle cell anemia, and are considerably resistant to malaria. In are- where malaria occurs, it exerts on the human population. O A. Directional selection O B. Disruptive selection O C. Bimodal selection O D.Stabilizing selection O E. None of the above K Question 20 of 120

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 6TYU: The continued presence of the allele that causes sickle cell anemia in areas where falciparum...

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The continued presence of the allele that causes sickle cell anemia in areas where falciparum malaria is prevalent demonstrates which of the following phenomena? (a) inbreeding depression (b) frequency-dependent selection (c) heterozygote advantage (d) genetic drift (e) a genetic bottleneck
The MN blood group is of interest to population geneticists because (a) people with genotype MN cannot receive blood transfusions from either MM or NN people (b) the MM, MN, and NN genotype frequencies can be observed directly and compared with calculated expected frequencies (c) the M allele is dominant to the N allele (d) people with the MN genotype exhibit frequency-dependent selection (e) people with the MN genotype exhibit heterozygote advantage
The Hardy-Weinberg equation characterizes the allele and genotypefrequenciesa. of a population that is experiencing selection for mating success.b. of a population that is extremely small.c. of a population that is very large and not evolving.d. of a community of species that is not evolving.e. of a community of species that is experiencing selection.
Scientists have concluded that the AS genotype as an adaptation for survival in Africa. Support the conclusion in terms of natural selection A. The frequency of the AS allele increases proportionately to the number of Africans in the population B. Because Malaria does not exist in the U.S and the AS allele does not provide any advantage to survival there. C. As the frequency of Malaria increases so does the frequency of the AS allele combination as it protects against getting Malaria D. Those without the AS genotype die out due to sickle cell disease; the populations left with a greater allelic frequency of the AS genotype
Explain why the sickle cell allele remained in populations that lived in very wet regions, despite it causing harm to people who are homozygous for that allele (i.e. explain the heterozygous advantage).
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 a particular population of mice, certain individualsdisplay a phenotype called short tail, which is inherited as a dominant trait. Some individuals display arecessive trait called dilute, which affects coat color.Which of these traits would be easier to eliminatefrom the population by selective breeding? Why?
Consider the gene that determines Rh blood type in human beings. This gene has two alleles (D, d) with D being dominant to d. Suppose that in a certain island population of 1000 individuals there are 250 individuals that have the genotype DD, 500 individuals that are heterozygotes, and 250 have the genotype dd. What are the genotype and allele frequencies in this population?
At an A/G single nucleotide polymorphism in a gene, 10% of individuals in the city of Oran have the genotype GG. Individuals with this GG genotype are susceptible to a new hemmorhagic virus, and 20% die. Assume those with AA and AG genotypes do not die, and everyone in the city catches the virus. Estimate the reduction in the G allele frequency after one generation due to negative selection. 0.2 0.005 0.01 0.05 0.02
With stronger natural selection, was the more beneficial allele lost from these small populations?a) It was lost very frequently, and the strength of natural selection did not make any difference.b) It was never lost.c) It was lost a few times, but not very often, and it was lost less frequently under strong selection.d) It was lost a few times, and it was lost more frequently under strong selection.
Which of the following is an example of stabilizing selection?a. Over time, Equus developed strength, intelligence, speed,and durable grinding teeth.b. British land snails mainly have two different phenotypes.c. Swiss starlings usually lay four or five eggs, therebyincreasing their chances of more offspring.d. Drug resistance increases with each generation; theresistant bacteria survive, and the nonresistant bacteriaget killed off.e. All of these are correct
Which statement is correct, based on current evolutionary theory? a. Selection will favor alleles only if they are good for the species. b. Selection will favor alleles only if, on average, they increase the reproductive success of individuals who have them. c. In small populations genetic drift can be more effective than natural selection in building adaptations. d. Selection sometimes favors alleles that systematically lower the reproductive success of the individuals who have them. e. Two of the above are correct.