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Q.

In human beings, sex is determined by the

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a

number of allosomes

b

number of sets of chromosomes

c

ratio of the number of X chromosomes to the number of sets of autosomes 

d

presence or absence of Y chromosome

answer is C.

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Detailed Solution

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In human beings, sex is determined by the presence or absence of Y chromosome (not by the number of X chromosomes unlike in X0 type of sex determination). Y chromosome has SRY gene that produces testis determining factor (TDF). A zygote with Y chromosome develops into male while a zygote without Y chromosomes develops into a female child.
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