Question 1

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the frequency of individuals with AA genotype?

Accepted Answer

A)   0.20
B)   0.32
C)   0.42
D)   0.81E) All of the above
F) None of the above

Question 2

A biologist doing a long-term study on a wild spider population observes increased variation in silk thickness.
Which of the following could the spider population be experiencing?

Accepted Answer

A)   directional selection
B)   stabilizing selection
C)   disruptive selection
D)   genetic driftE) B) and C)
F) A) and B)

Question 3

Use the following information to answer the question below.
Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86)  measured the snout-to-vent (anus)  length of Galápagos marine iguanas and observed the percent survival of different-sized animals, all of the same age. The graph shows the log snout-vent length (SVL, a measure of overall body size)  plotted against the percent survival of these different size classes for males and females.

Currently the only predators of Galápagos marine iguanas are Galápagos hawks. Iguana body size is not correlated with risk of hawk predation, although small iguanas can sprint faster than large iguanas. If predators (for example, cats)  that preferably catch and eat slower iguanas are introduced to the island, iguana body size is likely to ________ in the absence of other factors; the iguanas would then be under ________ selection.

Accepted Answer

A)   increase; directional
B)   increase; disruptive
C)   decrease; directional
D)   decrease; disruptiveE) None of the above
F) A) and C)

Question 4

Which of the following descriptions illustrates phenotype variation caused by environment?

Accepted Answer

A)   inheritance of body builder "physique"
B)   diet of caterpillars changes their morphology
C)   variation in horse coat color
D)   average beak depth during droughtE) A) and D)
F) B) and D)

Exam 23: The Evolution of Populations

A biologist doing a long-term study on a wild spider population observes increased variation in silk thickness. Which of the following could the spider population be experiencing?

Correct Answer
verified

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the frequency of individuals with AA genotype?

Correct Answer
verified

Correct Answer
verified

Which of the following descriptions illustrates phenotype variation caused by environment?

Correct Answer
verified

Exam 23: The Evolution of Populations

A biologist doing a long-term study on a wild spider population observes increased variation in silk thickness. Which of the following could the spider population be experiencing?

Correct AnswerverifiedShow Answer

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the frequency of individuals with AA genotype?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following descriptions illustrates phenotype variation caused by environment?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified