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How sex determination is carried out in Drosophila sp.?

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Whether or not the egg is fertilised and develops parthenogenetically

The proportion of X-chromosome pairs to male determinant autosome pairs

Chromosomes X and Y

The number of X-chromosomes divided by the number of autosome sets

answer is B.

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Detailed Solution

Concept: Calvin Bridges showed that the ratio of the number of X chromosomes to the sets of autosomes in Drosophila determines the sex.

The Y chromosome of Drosophila does not play a significant role in sex determination, according to the genic balance theory of sex-determination.

Hence, option 2 is correct answer

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