Question

What is fertilisation and how a sex of baby determine

Answer 1

Answer:

causes of y chromosome present in male

Answer 2

$\large \sf{Answer}$

During fertilization, the sperm cells race toward the mother-to-be's egg cell. If a sperm with a Y beats all others, then the fetus will be XY. The pregnancy will result in a boy. However, if a sperm with an X wins the race to the egg, then the fetus will be XX.