The predominant sexual identity of an individual as in male or female is known as
sex.
In human being, male is heterogametic and thus posses AA & XY while female is
homogametic & has AA and XX.
The male gametes produced are of two types. One containing A +X & other containing
A+Y chromosome (1:1 ratio) whereas female gamete is always A+X. When male (A+X) fertilizes an (A+X), 2A and XX individual is produced which is daughter. On the contrary, if the A+Y male gamete fertilizes an egg (A+X) the result is a son-
AA+XX X AA+XY
Mother Father
Gamete A+X egg A+X A+Y sperms
AA+XX AA+XY
Daughter Son