In Drosophila, the sex is determined by

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In Drosophila, the sex is determined by

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whether the egg is fertilised or develops parthenogenetically

the ratio of number of X chromosomes to the sets of autosomes

X chromosomes and Y chromosomes

the ratio of pairs of X chromosomes to the pairs of autosomes

answer is A.

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Detailed Solution

According to Bridges, in Drosophila Y-chromosome is heterochromatic so it is not active in sex determination. In Drosophila, sex determination takes place by sex index ratio.
$Sex index ratio = \frac{No . of X chromosomes}{No . of set of autosomes} = \frac{X}{A}$