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In Drosophila, the sex is determined by

1. whether the egg is fertilized or develops parthenogenetically
2. the ratio of number of X-chromosomes to the sets of autosomes
3. X and Y chromosomes
4. the ratio of pairs of X-chromosomes to the pairs of autosomes

Correct answer: the ratio of number of X-chromosomes to the sets of autosomes

Solution

Drosophila sex is determined by the X-to-autosome ratio, which sets the developmental pathway. The Y chromosome is not the primary sex-determining factor in flies; it mainly affects male fertility.

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