Natural Selection

Question 1

Which of the following best explains the importance of phenotypic variation?

Revolt · Accepted Answer

Phenotypic variation helps increase a population’s reproductive success and survival rate.

Question 2

Mice live in a shoreline ecosystem where there are areas of light-colored sand and areas of dark-brown grasses. The mode of selection likely to take place would be .

Revolt · Accepted Answer

disruptive

Question 3

In chimpanzees, young with low birth weight lose heat easily. Offspring with a high birth weight can have complications during birth because of their size. The mode of selection likely to take place would be .

Revolt · Accepted Answer

stabilizing

Question 4

As the common strain decreases, the rare strain .

Revolt · Accepted Answer

increases

Question 5

Fossils of black bears show that larger bears became more prevalent in the population over time. This is an example of selection.

Revolt · Accepted Answer

directional

Question 6

How has urbanization affected the evolution of the mosquito? Check all that apply.

Revolt · Accepted Answer

The original colony achieved reproductive isolation.; The mosquitoes’ physiological traits lent themselves to colonizing the new environment.; The presence of people provided a constant food source.

Question 7

When the influenza strains enter the host population, the common strain population size .

Revolt · Accepted Answer

increases

Question 8

This could be because the common influenza strain has susceptible hosts.

Revolt · Accepted Answer

many

Question 9

After reaching a maximum density, the common influenza strain population .

Revolt · Accepted Answer

declines

Natural Selection Answers

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