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Calvin Bridges showed that in fruit flies, the determination of sex depends on the proportion of X chromosomes to the number of autosomal sets.

1. True
2. False
3. Cannot be determined
4. None of these

Correct answer: True

Solution

Calvin Bridges demonstrated that in Drosophila, sex determination is based on the X:A ratio, where X represents the number of X chromosomes and A represents the sets of autosomes. This is a well-established fact.

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