Question 1

Natural selection for a certain phenotype will affect the _____ .

Accepted Answer

A)  genotype of an individual
B)  genotype of a population
C)  allele frequency of an individual
D)  allele frequency of a populationE) A) and D)
F) All of the above

Question 2

The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia.This is probably an example of _____

Accepted Answer

A)  gene flow.
B)  sexual selection.
C)  directional selection.
D)  founder effect.E) A) and B)
F) None of the above

Question 3

Some flowering plants cannot self-pollinate which increases their tendency to mate with phenotypically different mates, a process called disassortative mating.What effect would this have on a population in Hardy-Weinberg equilibrium?

Accepted Answer

A)  The population would remain in Hardy-Weinberg equilibrium.
B)  A decrease in heterozygotes would be observed.
C)  An increase in heterozygotes would be observed.
D)  No change homozygotes or heterozygotes would be observed.E) None of the above
F) A) and B)

Question 4

In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.This would lead to ____ in the ancestral giraffe population.

Accepted Answer

A)  disruptive selection
B)  directional selection
C)  sexual selection
D)  genetic driftE) A) and D)
F) None of the above

Question 5

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Accepted Answer

A)  0.01
B)  0.10
C)  0.18
D)  0.81E) B) and D)
F) All of the above

Question 6

When fisheries managers move fish from one lake to another, this causes gene ______.

Accepted Answer

A)  mutation
B)  blending
C)  flow
D)  dominanceE) A) and B)
F) A) and C)

Question 7

Being born with extra fingers on a hand is called polydactyly.This is more common in some populations in North America than others due to ____.

Accepted Answer

A)  natural selection in favor of extra fingers in these populations
B)  random mating with other populations in North America
C)  an increase in mutation rate in these populations
D)  a founder effect because their ancestors from Europe carried the allelesE) None of the above
F) C) and D)

Question 8

In disruptive selection, over time

Accepted Answer

A)  a population increases its variation (e.g., a wide selection of all beak sizes) .
B)  the population is strongly selected for in two directions (e.g., larger beak size and smaller beak size) .
C)  a population goes extinct.
D)  the most extreme outliers of a population are eliminated (e.g., the largest beaks and smallest beaks are eliminated) .E) B) and D)
F) B) and C)

Question 9

Genotypes are said to be in ___________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Accepted Answer

A)  Mendelian
B)  Hardy-Weinberg
C)  steady state
D)  homeostaticE) None of the above
F) A) and C)

Question 10

Many male songbirds are brightly colored.However, the color of the birds is determined by a balance of

Accepted Answer

A)  natural selection against bright colors by predation and sexual selection in favor of bright colors.
B)  gene flow that reduces bright colors and natural selection in favor of bright colors.
C)  mutations that reduce bright colors and sexual selection in favor of bright colors.
D)  mutations that reduce bright colors and gene flow in favor of bright colors.E) B) and D)
F) C) and D)

Question 11

Assortative and disassortative mating are similar in that both ____

Accepted Answer

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

Question 12

An insect population that becomes resistant to a commonly used insecticide is an example of _____.

Accepted Answer

A)  natural selection
B)  a founder effect
C)  disruptive selection
D)  gene flowE) None of the above
F) A) and D)

Question 13

If the frequency of an autosomal recessive trait in humans is 1 out of 100 births, what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Accepted Answer

A)  0.01
B)  0.10
C)  0.18
D)  0.81E) A) and B)
F) A) and C)

Question 14

The observation that most pureblood Native Americans have type O blood is best explained by _____

Accepted Answer

A)  gene flow.
B)  assortative mating.
C)  genetic drift.
D)  a founder effect.E) All of the above
F) A) and D)

Question 15

There are more than 30 blood group genes in humans, in addition to the ABO locus.This increases ____ in human populations.

Accepted Answer

A)  genetic variability
B)  homozygosity
C)  selective mating
D)  gene flowE) C) and D)
F) A) and D)

Question 16

Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72.Women with this waist to hip ratio are also the most fertile.By being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his ____ .

Accepted Answer

A)  longevity
B)  gene flow
C)  fitness
D)  allele frequencyE) B) and C)
F) A) and D)

Question 17

____ would produce the smallest evolutionary change in a given period of time in a population of birds.

Accepted Answer

A)  Mutation
B)  Migration
C)  Gene flow
D)  Assortive matingE) B) and C)
F) A) and C)

Exam 20: Genes Within Populations

Genotypes are said to be in ___________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Correct Answer
verified

When fisheries managers move fish from one lake to another, this causes gene ______.

Correct Answer
verified

In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.This would lead to ____ in the ancestral giraffe population.

Correct Answer
verified

Many male songbirds are brightly colored.However, the color of the birds is determined by a balance of

Correct Answer
verified

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Correct Answer
verified

Some flowering plants cannot self-pollinate which increases their tendency to mate with phenotypically different mates, a process called disassortative mating.What effect would this have on a population in Hardy-Weinberg equilibrium?

Correct Answer
verified

In disruptive selection, over time

Correct Answer
verified

Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72.Women with this waist to hip ratio are also the most fertile.By being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his ____ .

Correct Answer
verified

The observation that most pureblood Native Americans have type O blood is best explained by _____

Correct Answer
verified

If the frequency of an autosomal recessive trait in humans is 1 out of 100 births, what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Correct Answer
verified

The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia.This is probably an example of _____

Correct Answer
verified

There are more than 30 blood group genes in humans, in addition to the ABO locus.This increases ____ in human populations.

Correct Answer
verified

Natural selection for a certain phenotype will affect the _____ .

Correct Answer
verified

Being born with extra fingers on a hand is called polydactyly.This is more common in some populations in North America than others due to ____.

Correct Answer
verified

Assortative and disassortative mating are similar in that both ____

Correct Answer
verified

____ would produce the smallest evolutionary change in a given period of time in a population of birds.

Correct Answer
verified

An insect population that becomes resistant to a commonly used insecticide is an example of _____.

Correct Answer
verified

Exam 20: Genes Within Populations

Genotypes are said to be in ___________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Correct AnswerverifiedShow Answer

When fisheries managers move fish from one lake to another, this causes gene ______.

Correct AnswerverifiedShow Answer

In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.This would lead to ____ in the ancestral giraffe population.

Correct AnswerverifiedShow Answer

Many male songbirds are brightly colored.However, the color of the birds is determined by a balance of

Correct AnswerverifiedShow Answer

A human autosomal recessive trait appears in 1 in 100 births.What percent of people are homozygous dominant for this trait?

Correct AnswerverifiedShow Answer

Some flowering plants cannot self-pollinate which increases their tendency to mate with phenotypically different mates, a process called disassortative mating.What effect would this have on a population in Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

In disruptive selection, over time

Correct AnswerverifiedShow Answer

Average human males are most likely to be attracted to women with a waist to hip ratio of 0.72.Women with this waist to hip ratio are also the most fertile.By being attracted to women with a waist to hip ratio, a male is increasing his chances of having children and thus improve his ____ .

Correct AnswerverifiedShow Answer

The observation that most pureblood Native Americans have type O blood is best explained by _____

Correct AnswerverifiedShow Answer

If the frequency of an autosomal recessive trait in humans is 1 out of 100 births, what would be the expected frequency of heterozygote carriers for the trait if we assume that the gene is in Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar, yet they all differ markedly from their ancestral population in Asia.This is probably an example of _____

Correct AnswerverifiedShow Answer

There are more than 30 blood group genes in humans, in addition to the ABO locus.This increases ____ in human populations.

Correct AnswerverifiedShow Answer

Natural selection for a certain phenotype will affect the _____ .

Correct AnswerverifiedShow Answer

Being born with extra fingers on a hand is called polydactyly.This is more common in some populations in North America than others due to ____.

Correct AnswerverifiedShow Answer

Assortative and disassortative mating are similar in that both ____

Correct AnswerverifiedShow Answer

____ would produce the smallest evolutionary change in a given period of time in a population of birds.

Correct AnswerverifiedShow Answer

An insect population that becomes resistant to a commonly used insecticide is an example of _____.

Correct AnswerverifiedShow Answer

Correct Answer
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