Question

which environmental factor would likely lead to an increase in genetic variation in a population of squirrels?
○ an increase in predators
○ an increase in available food
○ an increase in forest fires
○ an increase in pollution

Explanation:

• An increase in predators would lead to natural selection, reducing genetic variation as only certain traits (e.g., better - hiding abilities) are favored.
• An increase in forest fires and pollution are environmental stresses that can cause bottleneck effects (reduction in population size, thus reducing genetic variation).
• An increase in available food means less competition for survival. Squirrels have a better chance of surviving and reproducing. With more individuals reproducing, there is a higher chance of different genetic combinations (from mutations and recombination during reproduction) being passed on, increasing genetic variation.

Answer:

an increase in available food