Refer to the Table

question 29

Multiple Choice

Refer to the table.
Suppose that, following the experiments by Dodd, Drosophila pseudoobscura are raised on 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 maltose-adapted females choosing maltose-adapted males over starch-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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