Refer to the Table

question 41

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. The results are in the table. Which conclusion is best supported by the data?

• A) No reproductive barriers evolved.
• B) Partial reproductive barriers evolved in one direction of the cross, with starch-adapted females choosing starch-adapted males over maltose-adapted males.
• C) Partial reproductive barriers evolved in both direction of the cross.
• D) Complete reproductive barriers evolved in both directions of the cross.

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Definitions:

Phenotypes

The observable characteristics or traits of an organism that result from the interaction of its genotype with the environment.

Recessive Traits

Traits that are expressed in an organism's phenotype only when two copies of the recessive allele are present.

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An eye color resulting from a lower concentration of melanin in the iris, allowing light to scatter in a way that makes the eyes appear blue.

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