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Exam 4: Genes and Their Evolution: Population Genetics

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Question 1

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Another name for the evolutionary force called gene flow is:

A) founder effect.
B) disruptive selection.
C) admixture.
D) transposition.

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Question 2

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In certain species of nonhuman primates there are groups where only one dominant female has access to mates.The other females must wait until the opportunity to gain mate access presents itself.This will have direct impacts on " fitness," influencing which of the following?

A) reproductive success
B) aggressiveness
C) strength
D) age at death

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Question 3

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Familial hypercholesterolemia,an autosomal dominant disease,is five times more frequent in the Afrikaaner population of South Africa than in the population of Europe or the United States.This represents an example of:

The absence of the A and B alleles in Native American populations is a result of:

An individual who displays the disease sickle-cell anemia must have inherited the deleterious allele from both phenotypically normal parents.This individual is therefore:

Frameshift mutations are more likely to have an impact at the phenotypic level because:

Population geneticists refer to a reproductive population as a deme.

A random change in allele frequencies over time is known as:

While conducting research with a small population in South America you note that an overwhelming majority of individuals exhibit signs of a specific genetic abnormality.This is most likely the result of:

Which of the evolutionary forces is most likely to decrease variation between populations?

A genetic study conducted over two generations found that the frequency of genotypes in the first generation were,AA: 0.36,Aa: 0.48,aa: 0.16.In the second generation,genotype frequencies remained the same.According to Hardy-Weinberg equilibrium,we can assume:

Which of the following is NOT a genetic disorder that decreases susceptibility to malaria?

Sickle-cell anemia is the result of a single-point mutation on chromosome 11.

The mutation known as trisomy 21,in which an extra copy of chromosome 21 is present,is more commonly known as:

Klinefelter's syndrome results from males passing on an extra copy of the X chromosome (resulting in a 47-chromosome,XXY karyotype).

Why is a frameshift mutation far more likely to lead to a defective protein compared with a point mutation?

Lactase persistence occurs in human populations with a long history of animal husbandry and milk consumption.

Mutations to which cells are most likely to have significant evolutionary consequences?

Evolution can best be defined as:

You are reading a scientific article about cheetahs that have stripes instead of spots.The article refers to this as a genetic mutation.Though you see it has no negative impacts on the cheetahs' fitness,the stripes are nevertheless considered a genetic mutation because: