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Question

Based on the experiments conducted by Bridges on Drosophila, the female sex of Drosophila is determined by the genes located on which chromosome?

A
Autosomes
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B
X and Y
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C
Y
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D
X
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Solution

The correct option is D X
Sex determination in Drosophila is governed by ratio of X chromosomes to number of sets of autosomes. The female determinant genes are present on the X chromosome and the male determinant genes are on the autosomes. The Y chromosome is not involved in determining sex but carries the genes that are active in forming sperm in adults. Hence, correct option is D.

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