The sex of a child depends on the type of male gamete (sperm) as the man produces sperms with either X or Y-chromosome. If a sperm carrying X-chromosome fertilises the ovum (female gamete with X-chromosome), then the child born will be a girl. This is because the child will have XX pair of sex chromosome. A woman has only daughters. This indicates that in child will have XX pair of sex chromosome. A woman has only daughters. This indicates that in every fusion, the sperm carrying X-chromosome fertilised the ovum.
