Question

Which one of the following is true for Drosophila?

(a) They don’t have X chromosome

(b) One of the female X chromosome is inactivated

(c) The male Y chromosome is inactivated

(d) The male X chromosome is hyper active

The question was asked by my school teacher while I was bunking the class.

My question is taken from Dosage Compensation Mechanism for X linked Genes topic in chapter Chromosomes and Sex Determination of Cytogenetics

Answer 1

Right answer is (d) The male X chromosome is hyper active

The best explanation: In Drosophila, dosage compensation is achieved in a different way. The male’s X chromosome appears to be hyperactivated, allowing it to be transcribed at twice the rate of either X chromosome in the female.