Question

How do we know that Drosophila utilizes a different sex-determination mechanism than mammals, even though it has the same sex-chromosome compositions in males and females?

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XXY flies being female (given the normal set of autosomes) implies that that the critical factor in sex determination is the ratio of X chromosomes to the number of haploid sets of autosomes.

XO flies being male (given the normal set of autosomes) implies that that the critical factor in sex determination is the ratio of X chromosomes to the number of haploid sets of autosomes.

XO flies being female (given the normal set of autosomes) implies that that the critical factor in sex determination is the ratio of X chromosomes to the number of haploid sets of autosomes.

XXY flies being male (given the normal set of autosomes) implies that that the critical factor in sex determination is the ratio of X chromosomes to the number of haploid sets of autosomes.