Sex Determination in Humans
* Humans show XY type of sex determining mechanism.
* Out of 23 pair of chromosomes, 22 are autosomes (same in both males and females).
* Females have a pair of X-chromosomes.
* Males have an X and a Y chromosome.
* During spermatogenesis males produce two types of gametes with equal probability – sperm carrying either X or Y chromosome.
* During oogenesis females produce only one types of gamete – having X chromosome.
* An ovum fertilised by the sperm carrying X-chromosome develops into a female (XX) and an ovum fertilised by the sperm carrying Y-chromosome develops into a male (XY).
B. The XXY individual suffers from Klinefelter’s syndrome.
