Genetic Diversity

1) In logistic growth (an S-shaped curve), how does population growth change as the population

 nears its carrying capacity?

A) Population growth increases.

B) Population growth remains steady.

C) Population growth decreases.

D) Population growth typically crashes when a population nears its carrying capacity.

2) Which of the following represents a type of top-down regulation for rattlesnakes living in Arizona?

A) the number of snake-eating hawks in the region

B) the number of mice in the region

C) abundance of rocks under which snakes can hide

D) the availability of fresh water

3) Parasites:

A) affect their hosts in a density-independent manner.

B) and their hosts represent a type of intraspecific competition.

C) occur in animals but not plants.

D) may live inside or outside of their host.

4) A keystone species:

A) typically reduces overall biodiversity of an ecosystem.

B) has a disproportionately large impact on the stability of an ecosystem.

C) is typically an herbivore.

D) is an example of amensalism.

5) Genetic diversity in a species does not arise from:

A) need or want.

B) hybridization.

C) crossover.

D) mutations.