XX male and XY females are very few in humans were: They are due to
XX male and XY females are very few in humans were: They are due to

Q. XX male and XY females are very few in humans were: They are due to

A.            genes of Y- chromosomes are on X- chromosome

B.            crossing over between X and Y

C.            Non disjunction of chromosomes

D.            All of the above

Answer: genes of Y- chromosomes are on X- chromosome
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