Question

why father is responsible for the sex of a newly born child?​

Answer 1

Let me help

from my book

here is pic

Hope it helps

Answer 2

Answer:

As the male gametes haves the X and Y allosomes .The female gametes have X and X chromosomes . Therefore, when the gametes fused it's depend upon the male gamete that what allosome is fused with the X allosome of female .