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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 maleThis question was posed to me during an interview.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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