Which chromosomes determine the sex in human beings?

Explanation

The sex determination in humans is XX-XY type. In human beings both females and males have same number of chromosomes i.e., 23 pairs . Out of 23 pairs 22 pairs, are exactly same in males and females. These are called autosomes. In addition to these (autosomes) female possesses two X chromosomes while male possess one X and the Y chromosome. During spermatogenesis among males, two types of gametes are produced 50% of the total sperm produced carry the X chromosomes and the rest 50% has Y chromosomes besides the autosomes. Females however, produce only one type of ovum with an X chromosome, There is equal probability of fertilisation of ovum with sperm carrying either X or Y chromosome. In case the ovum is fertilised with sperm carrying X chromosome, the zygote develops into a female and the fertilisation of ovum with Y chromosome carrying sperm results into male offspring. Thus, the sex of the child depends on the type of sperm involved in the fertilisation.