In Drosophila, the sex is determined by

The ratio or pairs of X-chromosomes to the pairs of autosomes

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Whether the egg is fertilised or develops parthenogenetically

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The ratio of number of X-chromosomes to the set of autosomes

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X and Y-chromosomes

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Solution

The correct option is C The ratio of number of X-chromosomes to the set of autosomes
Drosophila flies have both X and Y chromosomes, as well as autosomes. Unlike humans, the Y chromosome does not confer maleness; rather, it encodes genes necessary for making sperm. Sex is instead determined by the ratio of X chromosomes to autosomes (genic balance theory). It was demonstrated by Calvin Bridges.

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