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Eye color is a sex-linked trait in fruit flies, as these two Punnett squares show. (a) A male with white eyes mated to a female (2) with red eyes yields all red-eyed F, offspring. (b) An F, cross results in an F2 generation in which all females are red-eyed, half of the males are red-eyed, and half of the males are white-eyed.

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