Is it the male or female that determines the sex of a zygote? Based on chromosomes, how do we know this to be true

The male

Explanation:

A female always gives one X chromosome, a male can give either an X or a Y. If a zygote receives an X from its father and another X from its mother, it will be female. If a zygote receives a Y from its father and an X from its mother it will be male. Because the mother only has one option of chromosome to give, her chromosomes will not effect the gender of the zygote.

it takes hundreds of years to become stable.

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