Which one of the following statements is false?

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Unfertilised eggs develop into males in honeybees.

Somatic cells of male grasshoppers have even number of chromosomes.

Y chromosome has no role in sex determination in Drosophila.

In birds, the sex of the chicks depends on ovum but not the sperm.

answer is D.

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Detailed Solution

Grasshoppers exhibit X0 type of sex determination. The male (X0) has a single X chromosome while the female (XX) has two X chromosomes. So, males have odd number of chromosomes while females have even number of chromosomes. The male is heterogametic. Half of the sperms have X chromosome while the other half lack any allosome.

In Drosophila, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes.

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