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Males have the sex chromosomes X Y
Whereas females have the sex chromosomes X X.
A female’s gamete can be X or X, whereas a male's gametes can be X or Y.
A female can only pass on the X chromosome to her offspring.

If the man passes on his X chromosome, the child’s genotype will be X Y,
and will be a boy. If the man passes on his X chromosome, the child’s genotype will be X X, will be a girl.
The chance of a girl is 50%. The chance of a boy is 50%.

inheriting Sex (xx-xy) | GCSE Biology (9-1) | kayscience.com

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