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Select the incorrect statement.

1. Male fruit fly is heterogametic.
2. In male grasshoppers, 50% of sperms have no sex-chromosome.
3. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.
4. Human males have one, of their sex-chromosome much shorter than the other.

Correct answer: In domesticated fowls, sex of progeny depends on the type of sperm rather than egg.

Solution

In domesticated fowls, females are heterogametic (ZW) and produce two kinds of eggs, so the egg determines the sex of the progeny, not the sperm. The other statements correctly describe sex determination in fruit flies, grasshoppers, and human males.

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