Question

how. the sex of a child is determine

Answer 1

Hey!

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Neither the father nor the mother is responsible for the sex of the child.
There are 50 - 50 % chances of having a boy child and having a girl child.

Males have XY chromosomes, while females have XX chromosome.

So, if the sperm containing X chromosome fertilises the egg in females (which obviously has an X chromosome) then the new born baby will be a girl.

If the sperm containing Y chromosome fertilises the egg then the new born baby will be a boy.

So, it's just luck or whatever. By chance, you can say.


PS - I know the cross I made is really quite messed up!
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Hope it helps...!!!