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a
the ratio of pairs of X-chromosomes to the pairs of autosomes.
b
whether the egg is fertilised or develops parthenogenetically.
c
the ratio of number of X-chromosomes to the sets of autosomes.
d
X and Y-chromosomes.
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 =No. of X-chromosomesNo. of set of autosomes = XA