Principles of Inheritance and Variation Question 127
127. Drosophila flies with XXY genotype are females but in case of humans, such individuals are abnormal males (Klinefelter’s syndrome). This indicates that
[2000]
(a) The Y chromosome has no role in sex determination
(b) In Drosophila, the Y chromosome is essential for sex determination
(c) The $Y$ chromosome is male determining in humans
(d) The Y chromosome is female determining in Drosophila
Show Answer
Answer : c
Hints & Solution
(c) In human, the $Y$ chromosome bears the androgenic factor or the male determining factor. Whereas in Drosophila, the ratio of sex chromosomes to autosomes is the factor determining sex of the individual.
