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Which of the following is true for Drosophila sex determination?

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Which of the following is true for Drosophila sex determination?

(a) Males are produced by presence of Y chromosome

(b) Females are produced by presence of Y chromosome

(c) Two X chromosome will always produce a female

(d) Two Y chromosome will always produce a male

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This is a very interesting question from Sex Determination in Drosophila topic in division Chromosomes and Sex Determination of Cytogenetics

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The correct answer is (c) Two X chromosome will always produce a female

The best explanation: In Drosophila the sex is determined by the sex chromosome: set of autosome ratio. If X:A is 1 as in case of XX then it’s a female, ratio of 0.5 in case of XY gives a male. The presence or even absence of Y chromosome makes little difference.

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