Refer to the Table

question 49

Multiple Choice

Refer to the table.

- Suppose that, following the experiments by Dodd, Drosophila pseudoobscura are fed one of two diets (starch or maltose) for many generations. Once they have adapted to the new food sources, individual females from the starch treatment are given a choice between a male adapted to starch (a starch male) , or a male adapted to maltose (a maltose male) . When 50 females have chosen a mate, the experiment is repeated with females adapted to maltose. According to the results in the table, what percentage of maltose females chose starch males?

• A) 14%
• B) 26%
• C) 42%
• D) 52%

---

Definitions:

Medulla

An inner region or core in various organs or cells, often referring specifically to the innermost part of the kidney or the lower part of the brain stem.

Respiratory Centers

Centers in the medulla and pons that regulate breathing.

Chemoreceptors

Sensory receptors that respond to chemical stimuli, such as those found in the nose and taste buds.

Ventral Medulla

A key section of the brainstem involved in regulating autonomic functions, such as heart rate and breathing.