A) 2 pairs of autosomes and 1 pair of us chromosomes
B) 3 pairs of autosomes and 1 pair of sex chromosomes
C) 1 pair of autosomes and 3 pairs of sex chromosomes
D) 2 pairs of autosomes and 2 pairs of sex chromosomes
Correct Answer: B
Solution :
In Drosophila melanogaster, total number of chromosomes is 8, of which 6 chromosomes (3 pairs) are autosomes, common to both male and female and fourth pair (1 pair), 2 chromosomes is sex chromosomes. In male this is represented by XY (ie, male Drosophila has 6 + XY) and in female of XX (ie, female Drosophila has 6 + XX).
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