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In humans, the Y chromosome contains the male-determining factor. However, in Drosophila, sex is determined by the proportion of sex chromosomes to autosomes.

1. True
2. False
3. Indeterminate
4. Not applicable

Correct answer: True

Solution

In humans, the Y chromosome carries the SRY gene, which determines maleness. In Drosophila, the sex is determined by the ratio of X chromosomes to sets of autosomes (X:A ratio). Thus, the statement is correct.

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