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Q.
Drosophila melanogaster has
Chhattisgarh PMTChhattisgarh PMT 2007
Solution:
In Drosophila, total number of chromosomes is $ 8$, of which $6$ are autosomes, common to both male and female. The fourth pair is of sex chromosomes. In male, this is represented by $XY$ (ie, male Drosophila has $6 + $ XY) and in female by $XX$ (ie, female Drosophila has $6+XX$ ).