Biology NEET Full Syllabus Mock Test 180 Questions New Syllabus Mock Test - 8 PCB Single Correct MCQ
Published on: August 14, 2026

Drosophila flies with genotype are females, but human beings with such genotype are abnormal males. It shows that

A
Y-chromosome is essential for sex determination in Drosophila.
B
Y-chromosome is female determinant in Drosophila.
C
Y-chromosome is male determination in human beings.
D
Y-chromosome has no role in sex determination either in Drosophila or in human beings.

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Sex in Drosophila is a function of the ratio of the number of X chromosomes to the number of autosomal sets. Therefore a Drosophila with a X/A will be a female whereas the one with ratio will be male. However, in humans the presence or absence of the chromosome determines sex.

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