Which of these statements would be consistent with the changes we see in the frequency of the recessive allele? Natural selection has been favoring those individuals who are heterozygous alleles. Natural selection has been favoring those individuals who are homozygous for the hemoglobin S allele.

Which of these statements would be consistent with the changes we see in the frequency of the recessive allele? Natural selection has been favoring those individuals who are heterozygous alleles. Natural selection has been favoring those individuals who are homozygous for the hemoglobin S allele.

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 20QP: Natural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal...

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Concept explainers

Genetic Evolution

Sexual reproduction produces distinct population variations. Heredity determines the traits and qualities to be passed down to the progeny. Over time, this variation within-species is also affected by the process of human evolution. The study of how genetic variation leads to evolutionary changes is known as genetic evolution. If a trait helps an organism to survive and reproduce, it is more likely to be passed down the generations. It is rare that such traits result in a completely distinct set of traits in descendants than the ancestral population; this can result in the emergence of a new species.

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Which of these statements would be consistent with the changes we see in the frequency of the recessive allele?

Natural selection has been favoring those individuals who are heterozygous alleles.

Natural selection has been favoring those individuals who are homozygous for the hemoglobin S allele.

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Heterozygote advantage is an interesting condition in those individuals who have one of each allele (dominant and recessive) have a higher survival rate than those individuals who are either homozygous dominant or homozygous recessive. Sickle-cell anemia is such a genetic disease associated with the recessive allele. Normal homozygous individuals (SS) have normal blood cells that are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated. Although malaria cannot grow in these red blood cells, individuals often die because of the genetic defect. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to…
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