Question

how sex determine ...​

Answer 1

Answer:

by the 23rd pair of of chromosomes present in humans

Answer 2

Answer:

Sex determination

Thus, male mammals typically have an X and a Y chromosome (XY), while female mammals typically have two X chromosomes (XX). ... Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell.