Pretest

Question 1

Which environmental factor could lead to a decrease in genetic variation in a population of tuna?

Revolt · Accepted Answer

C: an increase in pollution

Question 2

A scientist has been tracking and studying a population of deer in Yellowstone National Park. He surveys the population every six months. Usually, the population is thriving and has a gene pool with a wide variety of traits. But during one six-month period, an event occurred that affected the population, and when the scientist returned, the amount of genetic variation had decreased significantly. Which of these is most likely the event that occurred to change the population?

Revolt · Accepted Answer

C: A population of wolves was introduced into Yellowstone National Park.

Question 3

A population of birds lives on a small island. Another population of the same species lives on the mainland. The distance between the island and the mainland is too great for birds to fly back and forth. Recently, a series of sandbars and tiny islands have formed between the island and the mainland. What is the most likely effect of this?

Revolt · Accepted Answer

C: an increase in gene flow between the bird populations

Question 4

Environmental factors can influence natural selection because they can increase or decrease

Revolt · Accepted Answer

A: the amount of genetic variation in a population.

Question 5

Which best defines gene flow?

Revolt · Accepted Answer

B: any movement of genes from one population to another

Question 6

Genetic drift in a population affects the gene pool in which of these ways?

Revolt · Accepted Answer

A: decrease in genetic variation

Question 7

In a population of seals, most of the seals have similar coloring. However, one seal has albinism. This seal is white and is almost completely blind. What is most likely the cause of this difference from the rest of the population?

Revolt · Accepted Answer

C: gene mutation

Question 8

Which of these is least likely to change the gene pool of a population of chipmunks?

Revolt · Accepted Answer

D: A number of chipmunks die due to old age.

Pretest Answers

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