Question 1

British land snails primarily occur in two extreme phenotypes. This is an example of

Accepted Answer

A)   directional selection.
B)   stabilizing selection.
C)   disruptive selection.
D)   genetic drift.
E)   mutation.F) None of the above
G) A) and C)

Question 2

If p 2 = 0.04, what is the frequency of homozygous recessives in the population?

Accepted Answer

A)   0.04
B)   0.2
C)   0.32
D)   0.64
E)   0.8F) None of the above
G) A) and E)

Question 3

A fraction of a green frog population survives a hurricane to reproduce and generate a new population. This event is an example of

Accepted Answer

A)   natural selection.
B)   genetic drift.
C)   founder effect.
D)   industrial melanism.
E)   gene flow.F) A) and B)
G) B) and D)

Question 4

In regards to natural selection, which of the following individuals would be considered the most fit?

Accepted Answer

A)   the individual that has the longest canine teeth
B)   the individual that has the greatest number of breeding opportunities
C)   the individual that has the best camouflage to avoid predators
D)   the individual that controls the largest territory
E)   the individual that has the greatest number of offspringF) A) and B)
G) C) and D)

Question 5

If people with freckles preferentially mated with other people with freckles, this would be an example of

Accepted Answer

A)   microevolution.
B)   natural selection.
C)   genetic drift.
D)   nonrandom mating.
E)   gene flow.F) B) and D)
G) A) and E)

Question 6

The usage of the insecticide DDT to control mosquitoes resulted in

Accepted Answer

A)   directional selection to insecticide resistance in the insects.
B)   stabilizing selection to insecticide resistance in the insects.
C)   disruptive selection to insecticide resistance in the insects.
D)   genetic drift to insecticide resistance in the insects.
E)   no change in the insect population.F) B) and C)
G) A) and B)

Question 7

What is the genotype of an individual that has protection from both sickle-cell disease and malaria?

Accepted Answer

A)   Hb AHb A
B)   Hb AHb S
C)   Hb SHb S
D)   Hb S Hb s
E)   Hb A Hb aF) A) and D)
G) C) and D)

Question 8

The conditions required by the Hardy-Weinberg equilibrium are commonly found in nature.

Accepted Answer

A) True 
 B)False

Question 9

A population of bacteria is not in Hardy-Weinberg equilibrium. Through repeated exposure to an antibiotic, the frequency of a recessive allele is rapidly increasing. What is the most likely explanation for this response?

Accepted Answer

A)   The recessive allele is responsible for susceptibility of the bacteria to the antibiotic.
B)   The dominant allele is responsible for susceptibility of the bacteria to the antibiotic.
C)   The recessive allele is responsible for resistance of the bacteria to the antibiotic.
D)   The population is experiencing gene flow.
E)   The population is experiencing disruptive selection.F) A) and E)
G) B) and D)

Question 10

If half of a population is homozygous recessive, what is p?

Accepted Answer

A)   0.5
B)   0.707
C)   0.25
D)   0.293
E)   0.1F) A) and E)
G) A) and D)

Question 11

Today, cheetahs show extreme genetic similarity. This is evidence of

Accepted Answer

A)   past gene flow.
B)   a past bottleneck event.
C)   a history of directional selection.
D)   a history of few genetic mutations.
E)   assortative mating.F) D) and E)
G) B) and E)

Question 12

Which of the following is a condition required for a Hardy-Weinberg equilibrium?

Accepted Answer

A)   Mutations must not occur.
B)   Natural selection must not occur.
C)   Random mating must occur.
D)   Genetic drift must not occur.
E)   All of the above are conditions required for Hardy-Weinberg Equilibrium.F) B) and D)
G) A) and E)

Question 13

The figure shown here represents stabilizing selection. What happens when an individual is produced that possesses a trait far away from the mean value?

Accepted Answer

A)   That extreme individual likely will not survive and reproduce.
B)   That extreme individual will be more likely to survive and reproduce.
C)   That extreme individual will have neither an advantage nor a disadvantage over other individuals.
D)   All phenotypes have equal likelihood of surviving and reproducing.
E)   The average phenotype is less likely to survive and reproduce.F) A) and B)
G) All of the above

Question 14

Why does malaria persist in the human population?

Accepted Answer

A)   Too few humans have died of malaria to end the disease.
B)   Heterozygote advantage maintains both the normal allele and the sickle cell allele in the population.
C)   Malaria is a recessive disease and few humans contract it.
D)   Humans are protected from the malaria parasite.
E)   Malaria is under stabilizing selection.F) A) and B)
G) A) and E)

Question 15

Which of the following generates genetic variation within a population?

Accepted Answer

A)   genetic recombination
B)   independent assortment of alleles
C)   sexual reproduction
D)   mutation
E)   All of the above answers describe ways that genetic variation is generated in a population.F) B) and C)
G) C) and E)

Question 16

Biotic environments that influence natural selection include all but which of the following?

Accepted Answer

A)   competition
B)   predation
C)   parasitism
D)   weather
E)   diseaseF) B) and D)
G) D) and E)

Question 17

Directional selection in the modern horse is demonstrated by

Accepted Answer

A)   populations consisting of only very dark and very light colored horses.
B)   the rapid decrease in size over the last 200 years.
C)   the gradual increase in size over millions of years.
D)   fossils which show the horse has not changed in millions of years.
E)   the extinction of other horse species.F) A) and D)
G) A) and C)

Question 18

What characteristic is common of both a genetic bottleneck and a founder effect?

Accepted Answer

A)   Both encounter a population crash.
B)   Both involve a portion of a population becoming isolated.
C)   Both involve a decrease in a population's genetic diversity.
D)   Both affect the entire population.
E)   Both are a type of natural selection.F) None of the above
G) B) and C)

Question 19

The members of a population survive and successfully reproduce due to the specific phenotypes they posses. This is an example of

Accepted Answer

A)   natural selection.
B)   genetic drift.
C)   founder effect.
D)   industrial melanism.
E)   gene flow.F) A) and B)
G) A) and E)

Exam 15: Evolution on a Small Scale

The conditions required by the Hardy-Weinberg equilibrium are commonly found in nature.

Correct Answer
verified

If p ² = 0.04, what is the frequency of homozygous recessives in the population?

Correct Answer
verified

If half of a population is homozygous recessive, what is p?

Correct Answer
verified

Which of the following is a condition required for a Hardy-Weinberg equilibrium?

Correct Answer
verified

If people with freckles preferentially mated with other people with freckles, this would be an example of

Correct Answer
verified

The members of a population survive and successfully reproduce due to the specific phenotypes they posses. This is an example of

Correct Answer
verified

What characteristic is common of both a genetic bottleneck and a founder effect?

Correct Answer
verified

Why does malaria persist in the human population?

Correct Answer
verified

Today, cheetahs show extreme genetic similarity. This is evidence of

Correct Answer
verified

Directional selection in the modern horse is demonstrated by

Correct Answer
verified

In regards to natural selection, which of the following individuals would be considered the most fit?

Correct Answer
verified

What is the genotype of an individual that has protection from both sickle-cell disease and malaria?

Correct Answer
verified

A population of bacteria is not in Hardy-Weinberg equilibrium. Through repeated exposure to an antibiotic, the frequency of a recessive allele is rapidly increasing. What is the most likely explanation for this response?

Correct Answer
verified

Biotic environments that influence natural selection include all but which of the following?

Correct Answer
verified

The figure shown here represents stabilizing selection. What happens when an individual is produced that possesses a trait far away from the mean value?

Correct Answer
verified

A fraction of a green frog population survives a hurricane to reproduce and generate a new population. This event is an example of

Correct Answer
verified

Which of the following generates genetic variation within a population?

Correct Answer
verified

British land snails primarily occur in two extreme phenotypes. This is an example of

Correct Answer
verified

The usage of the insecticide DDT to control mosquitoes resulted in

Correct Answer
verified

Exam 15: Evolution on a Small Scale

The conditions required by the Hardy-Weinberg equilibrium are commonly found in nature.

Correct AnswerverifiedShow Answer

If p 2 = 0.04, what is the frequency of homozygous recessives in the population?

Correct AnswerverifiedShow Answer

If half of a population is homozygous recessive, what is p?

Correct AnswerverifiedShow Answer

Which of the following is a condition required for a Hardy-Weinberg equilibrium?

Correct AnswerverifiedShow Answer

If people with freckles preferentially mated with other people with freckles, this would be an example of

Correct AnswerverifiedShow Answer

The members of a population survive and successfully reproduce due to the specific phenotypes they posses. This is an example of

Correct AnswerverifiedShow Answer

What characteristic is common of both a genetic bottleneck and a founder effect?

Correct AnswerverifiedShow Answer

Why does malaria persist in the human population?

Correct AnswerverifiedShow Answer

Today, cheetahs show extreme genetic similarity. This is evidence of

Correct AnswerverifiedShow Answer

Directional selection in the modern horse is demonstrated by

Correct AnswerverifiedShow Answer

In regards to natural selection, which of the following individuals would be considered the most fit?

Correct AnswerverifiedShow Answer

What is the genotype of an individual that has protection from both sickle-cell disease and malaria?

Correct AnswerverifiedShow Answer

A population of bacteria is not in Hardy-Weinberg equilibrium. Through repeated exposure to an antibiotic, the frequency of a recessive allele is rapidly increasing. What is the most likely explanation for this response?

Correct AnswerverifiedShow Answer

Biotic environments that influence natural selection include all but which of the following?

Correct AnswerverifiedShow Answer

The figure shown here represents stabilizing selection. What happens when an individual is produced that possesses a trait far away from the mean value?

Correct AnswerverifiedShow Answer

A fraction of a green frog population survives a hurricane to reproduce and generate a new population. This event is an example of

Correct AnswerverifiedShow Answer

Which of the following generates genetic variation within a population?

Correct AnswerverifiedShow Answer

British land snails primarily occur in two extreme phenotypes. This is an example of

Correct AnswerverifiedShow Answer

The usage of the insecticide DDT to control mosquitoes resulted in

Correct AnswerverifiedShow Answer

Correct Answer
verified

If p ² = 0.04, what is the frequency of homozygous recessives in the population?

Correct Answer
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