How does X chromosome dosage compensation in Drosophila differ from that process

Question

How does X chromosome dosage compensation in Drosophila differ from that process in humans?

A. In Drosophila, sex is determined by the balance between X chromosomes and sets of autosomes. X chromosome inactivation occurs both sexes.

B. X inactivation in Drosophila females is not random but depends on the quality of genetic products of each X chromosome.

C. Instead of X chromosome inactivation, X-linked genes in Drosophila are transcribed at twice the rate in males compared to females.

D. Drosophila females have three X chromosomes; two of them must be inactivated instead of one as in human females.

Explanation / Answer

The correct option is C. Instead of X chromosome inactivation, X-linked genes in Drosophila are transcribed at twice the rate in males compared to females.

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