Answered: Deleterious recessive alleles, such as…

Deleterious recessive alleles, such as the allele that causes cystic fibrosis, can persist in a population indefinitely. Why aren’t these rare alleles eliminated completely?

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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Deleterious recessive alleles, such as the allele that causes cystic fibrosis, can persist in a population indefinitely. Why aren’t these rare alleles eliminated completely?

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Which disappears more rapidly from a population, a deleterious dominant allele or a deleterious recessive allele? Why do you think this is so?
Why do recessive lethals persist in a population? Provide an example of a recessive lethal allele.
Because of a genetic variation in the population what is a possible outcome?
Why are some lethal recessive mutations such as Tay-Sachs disease not eliminated from a population?
It is said,that the harmfull alleles get eliminated from population over a period of time,yet sickle cell anaemia is persisting in human population.why?
Natural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal in the homozygous condition ever be completely removed from a large population by natural selection?
For EACH of the observed traits, which is most frequent in our class population, the dominant phenotype or the recessive phenotype? Why?
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?
If 98 out of 200 individuals in a population express the recessive phenotype, what percent of the population are heterozygotes?
The recessive allele that causes Ellis– van Creveld syndrome when homozygous has a frequency of about 0.07 in the Amish population of Pennsylvania, although its frequency is only about 0.001 in the generalpopulation. How many persons out of one thousand in the Amish population would be expected to have the disease? How many out of one million in the general population?
Natural selection means that the environment favors survival of some genotypes. From where does diversity in genotypes come?
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