The Figure Shows the Relationships Between Oldfield Mice Populations

question 18

Multiple Choice

The figure shows the relationships between oldfield mice populations. Light-colored beach populations are shown with a triangle; dark-colored inland populations are shown with circles. Which of the following statements is consistent with this phylogeny?

• A) Light coat color arose multiple times independently in different beach populations.
• B) The light-coat allele arose prior to colonization of beach populations.
• C) Natural selection favors light coat color when the Mc1R allele is mutated.
• D) Dark-colored populations are derived from migrants from the beach populations.

---

Definitions:

Systematic Desensitization

A behavioral therapy technique used to gradually reduce anxiety and fear through the use of relaxation and exposure to feared stimuli.

Shock Therapy

A form of medical treatment involving the application of electrical current to the brain, often used in psychiatry to treat severe mental disorders.

Conditioned Stimulus

A previously neutral stimulus that, after being paired repeatedly with an unconditioned stimulus, begins to trigger a conditioned response.

Unconditioned Stimulus

In classical conditioning, a stimulus that naturally triggers a response without any need for prior learning.