How chromosome plays role in sex determination?
Human body contains 22 pairs (total number 44) of autosomes and 1 pair (total number 2) of sex chromosome. The two sex chromosomes are marked with X and Y that play a significant role in determining sex. Female gametes contain two X chromosomes (XX) and male gamete contains one X and one Y chromosome (XY). An egg can be fertilized with either type X or Y. Therefore, a zygote can have both the chromosomes as type X, or can have one X and the other Y. XX and XY zygotes will be female and male respectively. In determining sex, a mother plays no role because the mother always produces eggs containing only an X chromosome. On the other hand, the father produces sperms having both the type X and Y.
