Question

Sex determination in human being .

Answer 1

Sex determination in human being is done by what the child inherit from his father.

If it inherits "X" chromosome then it will be a girl

Or if it ingerits "Y" chromosome from its father then it will be a boy.

Because mother always gives "X"chromosome.

hence it is the sperm which determines sex of the child..

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Answer 2

Here we go!!!

Females in humans have 2X chromosomes- 1 each is inherited from either parent and denoted as XX. Males in humans have 1X and 1 Y chromosome, where the X is inherited from the mother and the Y from the father. In a way, we can say that it is the father who determines the sex of the unborn child. This can put to shame a lot of history in which people believed it is the woman who was responsible for not giving birth to a male heir. We can also say that the absence of the Y chromosome makes the individual a female.
At the time of spermatogenesis in males, both types of gametes are produced- one carrying the X chromosome and one carrying the Y. At the time of fertilization, the sex of the resulting zygote will depend on which gamete of the father will fuse with the X of the mother. We can, therefore, say that there is a 50% chance that the child will be a male and 50% that it can be a female.

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