Question 1

A _________ locus exhibits more variation than is expected by mutation.

Accepted Answer

A)  polymorphic
B)  double
C)  mosaic
D)  allelicE) All of the above
F) B) and D)

Question 2

In the Hardy-Weinberg equations,the frequencies of 2 alleles in a population (where there are only 2 alleles to consider) can be designated as

Accepted Answer

A)  (p + q) 2.
B)  p and q.
C)  p2 and q2.
D)  2pq.
E)  1 - p and 1 - q.F) B) and D)
G) D) and E)

Question 3

In negative frequency-dependent selection,such as in the study done on the water boatman insect,the incidence of predation leads to an

Accepted Answer

A)  elimination of a rare genotype.
B)  even distribution of genotype frequencies.
C)  increase in a rare genotype.
D)  increase in variation within the population.
E)  increase in a rare genotype and an increase in variation within the population.F) A) and B)
G) D) and E)

Question 4

The gene pool includes

Accepted Answer

A)  all of the fitness within a population.
B)  all of the individuals within a population.
C)  all of the mutations within a population.
D)  all of the adaptations within a population.
E)  all of the alleles of genes within a population.F) A) and B)
G) None of the above

Question 5

The disease,sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA) .Individuals with severe sickle-cell anemia (SS) usually die before reproduction.Assume that a population under Hardy-Weinberg equilibrium has allele frequencies of A = 0.8 and S = 0.2.Assume that this population is then subject to the following selection forces:
AA: 15% die of malaria
AS: 5% die of malaria
SS: 100% die of severe sickle-cell anemia
What will be the frequency of the S allele after selection occurs?

Accepted Answer

A)  0.0
B)  0.04
C)  0.15
D)  0.18
E)  0.3F) D) and E)
G) A) and E)

Question 6

You are studying a population of geese in which there are two color phases,brown and gray.Color in this species is controlled by a single gene,with brown dominant to gray.A random sample of 250 geese shows that 210 are brown.What percentage of the brown geese are heterozygous? (Assume that the population is in Hardy-Weinberg equilibrium. )

Accepted Answer

A)  36%
B)  43%
C)  48%
D)  57%
E)  84%F) B) and E)
G) B) and D)

Question 7

At least some of the requirements for a Hardy-Weinberg equilibrium would be in effect on the island.For instance there is probably

Accepted Answer

A)  high rates of immigration.
B)  a very large population size.
C)  little gene flow.
D)  no mutation.
E)  random mating.F) B) and C)
G) A) and E)

Question 8

Antigens on red blood cells are hereditary traits that allow blood to be typed in different ways.One system is based on a gene with two alleles,M and N.If the frequency of the M allele in a population is 0.4,then according to the Hardy-Weinberg rule,the expected frequency of the heterozygous MN genotype is ____.

Accepted Answer

A)  0.16
B)  0.24
C)  0.36
D)  0.48
E)  0.6F) A) and E)
G) All of the above

Question 9

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Accepted Answer

A)  natural selection.
B)  creation of new species.
C)  genetic drift.
D)  outcrossing.
E)  increasing evolutionary resistancE.F) D) and E)
G) B) and E)

Question 10

Assortive and disassortive mating are similar in that both

Accepted Answer

A)  change only the expected Hardy-Weinberg allele frequencies in a population.
B)  change only the expected Hardy-Weinberg genotype frequencies in a population.
C)  change both the expected Hardy-Weinberg allele and genotype frequencies in a population.
D)  are kinds of selection pressure.
E)  are examples of random mating.F) B) and E)
G) B) and C)

Question 11

The type of non-random mating that causes the frequencies of particular genotypes to differ greatly from those predicted by the Hardy-Weinberg equilibrium is called

Accepted Answer

A)  mutation.
B)  migration.
C)  genetic drift.
D)  assortative mating.
E)  selection.F) A) and E)
G) None of the above

Question 12

Biologists examined the question of variation in different genes through studies on

Accepted Answer

A)  blood groups only.
B)  enzymes only.
C)  learning only.
D)  blood groups,enzymes,and learning.
E)  blood groups and enzymes.F) B) and E)
G) D) and E)

Question 13

Gene flow,defined as the movement of genes from one population to another,can take place by migration,as well as

Accepted Answer

A)  mating with certain trait-containing individuals.
B)  mating with dominant phenotypes.
C)  hybridization between individuals of adjacent populations.
D)  removing the barriers between the populations.
E)  physical movement of genes within an individual by transposons.F) C) and E)
G) A) and D)

Question 14

Which one of the following could not be involved in gene flow?

Accepted Answer

A)  wind-blown pollen
B)  gametes dispersed by ocean currents
C)  zygotes dispersed by ocean currents
D)  disassortive mating within a population
E)  hybridization between neighboring populationsF) A) and B)
G) None of the above

Question 15

Hardy-Weinberg pointed out that the original proportions of the genotypes in a population would remain constant from generation to generation if certain assumptions are met.Which one of the following is not a Hardy-Weinberg condition?

Accepted Answer

A)  The population is very large.
B)  No gene flow occurs.
C)  No selection occurs.
D)  Random mating occurs.
E)  No polymorphic loci exist in the population.F) A) and E)
G) C) and D)

Question 16

Populations of humans are known to have founder effects.For instance there are small populations in the US that frequently show

Accepted Answer

A)  6 fingers.
B)  4 fingers.
C)  complete hairlessness.
D)  blue hair.
E)  No human populations are known to have founder effects.F) All of the above
G) B) and D)

Question 17

Certain small towns in the western United States have remained isolated and inbred since their settlement many years ago.Some alleles are more common in these communities as compared to the rest of the population.This effect is known as

Accepted Answer

A)  artificial selection.
B)  directional selection.
C)  disrupting selection.
D)  Hardy-Weinberg principle.
E)  founder principlE.F) C) and E)
G) A) and D)

Question 18

Which one of the following is not an agent of evolutionary change?

Accepted Answer

A)  mutation
B)  gene flow
C)  random mating
D)  genetic drift
E)  selectionF) B) and D)
G) B) and E)

Question 19

Which of the following examples is not evidence that natural selection is at work?

Accepted Answer

A)  The color of a caterpillar larva matches the color of the leaves of its host plant.
B)  Turtles hatched from eggs in moist sand are larger than those hatched from eggs in dry sand.
C)  A species of lizard is dark if it lives on cooled lava,but white if it lives on sand.
D)  Enzyme polymorphism in a widespread species changes with geography.
E)  An insect population becomes resistant to a commonly used insecticidE.F) A) and B)
G) B) and D)

Question 20

Compared with Hardy-Weinberg predictions,populations that have practiced assortative mating have

Accepted Answer

A)  fewer homozygotes.
B)  less natural selection.
C)  more heterozygotes.
D)  more homozygotes.
E)  more mutations.F) C) and D)
G) All of the above

Exam 20: Genes Within Populations

Which one of the following is not an agent of evolutionary change?

Correct Answer
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Which one of the following could not be involved in gene flow?

Correct Answer
verified

The gene pool includes

Correct Answer
verified

Biologists examined the question of variation in different genes through studies on

Correct Answer
verified

In negative frequency-dependent selection,such as in the study done on the water boatman insect,the incidence of predation leads to an

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Correct Answer
verified

Gene flow,defined as the movement of genes from one population to another,can take place by migration,as well as

Correct Answer
verified

Populations of humans are known to have founder effects.For instance there are small populations in the US that frequently show

Correct Answer
verified

Correct Answer
verified

At least some of the requirements for a Hardy-Weinberg equilibrium would be in effect on the island.For instance there is probably

Correct Answer
verified

Certain small towns in the western United States have remained isolated and inbred since their settlement many years ago.Some alleles are more common in these communities as compared to the rest of the population.This effect is known as

Correct Answer
verified

Hardy-Weinberg pointed out that the original proportions of the genotypes in a population would remain constant from generation to generation if certain assumptions are met.Which one of the following is not a Hardy-Weinberg condition?

Correct Answer
verified

The type of non-random mating that causes the frequencies of particular genotypes to differ greatly from those predicted by the Hardy-Weinberg equilibrium is called

Correct Answer
verified

Which of the following examples is not evidence that natural selection is at work?

Correct Answer
verified

Assortive and disassortive mating are similar in that both

Correct Answer
verified

A _________ locus exhibits more variation than is expected by mutation.

Correct Answer
verified

Compared with Hardy-Weinberg predictions,populations that have practiced assortative mating have

Correct Answer
verified

In the Hardy-Weinberg equations,the frequencies of 2 alleles in a population (where there are only 2 alleles to consider) can be designated as

Correct Answer
verified

Exam 20: Genes Within Populations

Which one of the following is not an agent of evolutionary change?

Correct AnswerverifiedShow Answer

Which one of the following could not be involved in gene flow?

Correct AnswerverifiedShow Answer

The gene pool includes

Correct AnswerverifiedShow Answer

Biologists examined the question of variation in different genes through studies on

Correct AnswerverifiedShow Answer

In negative frequency-dependent selection,such as in the study done on the water boatman insect,the incidence of predation leads to an

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The genetic preservation of the features that increase the likelihood of survival and reproduction of some individuals within a population is called the process of

Correct AnswerverifiedShow Answer

Gene flow,defined as the movement of genes from one population to another,can take place by migration,as well as

Correct AnswerverifiedShow Answer

Populations of humans are known to have founder effects.For instance there are small populations in the US that frequently show

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

At least some of the requirements for a Hardy-Weinberg equilibrium would be in effect on the island.For instance there is probably

Correct AnswerverifiedShow Answer

Certain small towns in the western United States have remained isolated and inbred since their settlement many years ago.Some alleles are more common in these communities as compared to the rest of the population.This effect is known as

Correct AnswerverifiedShow Answer

Hardy-Weinberg pointed out that the original proportions of the genotypes in a population would remain constant from generation to generation if certain assumptions are met.Which one of the following is not a Hardy-Weinberg condition?

Correct AnswerverifiedShow Answer

The type of non-random mating that causes the frequencies of particular genotypes to differ greatly from those predicted by the Hardy-Weinberg equilibrium is called

Correct AnswerverifiedShow Answer

Which of the following examples is not evidence that natural selection is at work?

Correct AnswerverifiedShow Answer

Assortive and disassortive mating are similar in that both

Correct AnswerverifiedShow Answer

A _________ locus exhibits more variation than is expected by mutation.

Correct AnswerverifiedShow Answer

Compared with Hardy-Weinberg predictions,populations that have practiced assortative mating have

Correct AnswerverifiedShow Answer

In the Hardy-Weinberg equations,the frequencies of 2 alleles in a population (where there are only 2 alleles to consider) can be designated as

Correct AnswerverifiedShow Answer

Correct Answer
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