Now we can understand easily that the father or mother is
responsible for the birth of a son or daughter. Both male and female have 44
autosomes, a pair of sex chromosome. Sex chromosome of a female is XX and that
of the male is XY. The male gamete (sperm) bears X and Y chromosome. But the
female gamete (egg) bears X and X. If the X bearing egg of the female is united
(fertilize) with Y bearing sperm of the male, the child will have XY. A child
having such chromosomes will be a male child. It is seen that if there is no Y
chromosome, the child will never be a son. There is no Y chromosome in a
female; Y chromosome is present only in male. So if a couple do not have any male
child, the husband is responsible not the wife.
A figure on this ssue shows:
Thanks, visit http://itehelp.blogspot.com