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Which chromosome pair determines sex in Drosophila?

Option: 1

1st pair

Option: 2

2nd pair

Option: 3

3rd pair

Option: 4

 4th pair

Answers (1)


The second pair of chromosomes in Drosophila is the pair that controls sex. The proportion of X chromosomes to the total number of sets of autosomes (A) in Drosophila is used to identify gender. Drosophila has X and Y sex chromosomes, with females having XX and males having XY. The quantity of X chromosomes in the 2nd chromosome pair determines the ratio of sets of autosomes to X chromosomes. For instance, a female fly is produced when the ratio is 1:1 (i.e., 1 X chromosome to 2 sets of autosomes), whereas a male fly is produced when the ratio is 1:2 (i.e., 1 X chromosome to 4 sets of autosomes). Therefore, in Drosophila, the fly's sex is determined by the 2nd pair of chromosomes.

Option 2 is the correct answer.

Posted by

Gautam harsolia

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