Females of the species Drosophila pseudoobscura respond less well to courtship signals from males of their close relative D.persimilis than they do to those of males of their own species.This is an example of

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Behavioral isolation refers to differences in behaviors or signals used for attracting mates that prevent reproduction between closely related species. In this example, the females of Drosophila pseudoobscura are less responsive to courtship signals from males of D.persimilis, a closely related species, indicating a behavioral barrier to reproduction.

Females of the Species Drosophila Pseudoobscura Respond Less Well to Courtship