<P> Chromosomal sex is determined at the time of fertilization ; a chromosome from the sperm cell , either X or Y , fuses with the X chromosome in the egg cell . Gonadal sex refers to the gonads , that is the testis or ovaries , depending on which genes are expressed . Phenotypic sex refers to the structures of the external and internal genitalia . </P>
<P> Chromosomal sex is determined at the time of fertilization ; a chromosome from the sperm cell , either X or Y , fuses with the X chromosome in the egg cell . Gonadal sex refers to the gonads , that is the testis or ovaries , depending on which genes are expressed . Phenotypic sex refers to the structures of the external and internal genitalia . </P>
when do you become genetically male or female
when do you become genetically male or female
at the time of fertilization
at the time of fertilization