A) XX-XY
B) XX-XO
C) ZZ-ZW
D) Both (a) and (b)
Correct Answer: A
Solution :
In humans and in Drosophila the males have one X and one Y-chromosome, whereas female have a pair of X-chromosomes besides autosomes. In birds. ZZ-ZW mechanisms and in grasshopper, sex determination mechanism is XX-XO type.
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