Question 1

Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating

Accepted Answer

A)  the bottleneck effect.
B)  disruptive selection.
C)  frequency-dependent selection.
D)  neutral variation.
E)  stabilizing selection.F) A) and E)
G) All of the above

Question 2

Which of the following statements best summarizes evolution as it is viewed today?

Accepted Answer

A)  It represents the result of selection for acquired characteristics.
B)  It is synonymous with the process of gene flow.
C)  It is the descent of humans from the present-day great apes.
D)  It is the differential survival and reproduction of the most-fit phenotypes.E) A) and C)
F) A) and B)

Question 3

In the United States, the parasite that causes malaria is not present, but African-Americans whose ancestors were from equatorial Africa are present. What should be happening to the sickle-cell allele in the United States, and what should be happening to it in equatorial Africa?

Accepted Answer

A)  stabilizing selection; disruptive selection
B)  disruptive selection; stabilizing selection
C)  disruptive selection; directional selection
D)  directional selection; disruptive selection
E)  directional selection; stabilizing selectionF) C) and E)
G) B) and E)

Question 4

Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer, or more, than this have reduced fitness. Which of the following terms best describes this situation?

Accepted Answer

A)  artificial selection
B)  directional selection
C)  stabilizing selection
D)  disruptive selection
E)  sexual selectionF) All of the above
G) A) and E)

Question 5

Use this information to answer the following questions.
You are studying three populations of birds. Population A has ten birds, of which one is brown (a recessive trait)  and nine are red. Population B has 100 birds, of which ten are brown. Population C has 30 birds, and three of them are brown.
-In which population would it be least likely that an accident would significantly alter the frequency of the brown allele?

Accepted Answer

A)  population A
B)  population B
C)  population C
D)  They are all the same.
E)  It is impossible to tell from the information given.F) A) and B)
G) A) and E)

Question 6

The following questions refer to the following paragraph.
HIV's genome of RNA includes the code for reverse transcriptase (RT) , an enzyme that acts early in infection to synthesize a DNA genome from an RNA template. The HIV genome also codes for protease (PR) , an enzyme that acts later in infection by cutting long viral polyproteins into smaller, functional proteins. Both RT and PR represent potential targets for antiretroviral drugs. Drugs called nucleoside analogues (NA)  act against RT, whereas drugs called protease inhibitors (PI)  act against PR.
-Within the body of an HIV-infected individual who is being treated with a single NA, and whose HIV particles are currently vulnerable to this NA, which of these situations can increase the relative fitness of the virus? 1. mutations resulting in RTs with decreased rates of nucleotide mismatch
2. mutations resulting in RTs with increased rates of nucleotide mismatch
3. mutations resulting in RTs that have proofreading capability

Accepted Answer

A)  1 only
B)  2 only
C)  3 only
D)  1 and 3
E)  2 and 3F) B) and C)
G) D) and E)

Exam 23: The Evolution of Populations

Correct Answer
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Correct Answer
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Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating

Correct Answer
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In the United States, the parasite that causes malaria is not present, but African-Americans whose ancestors were from equatorial Africa are present. What should be happening to the sickle-cell allele in the United States, and what should be happening to it in equatorial Africa?

Correct Answer
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Which of the following statements best summarizes evolution as it is viewed today?

Correct Answer
verified

Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer, or more, than this have reduced fitness. Which of the following terms best describes this situation?

Correct Answer
verified

Exam 23: The Evolution of Populations

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Sparrows with average-sized wings survive severe storms better than those with longer or shorter wings, illustrating

Correct AnswerverifiedShow Answer

In the United States, the parasite that causes malaria is not present, but African-Americans whose ancestors were from equatorial Africa are present. What should be happening to the sickle-cell allele in the United States, and what should be happening to it in equatorial Africa?

Correct AnswerverifiedShow Answer

Which of the following statements best summarizes evolution as it is viewed today?

Correct AnswerverifiedShow Answer

Most Swiss starlings produce four to five eggs in each clutch. Starlings producing fewer, or more, than this have reduced fitness. Which of the following terms best describes this situation?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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