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Q.

In Drosophila, the sex is determined by

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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
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