<P> A baby 's sex is determined at the time of conception . When the baby is conceived , a chromosome from the sperm cell , either X or Y , fuses with the X chromosome in the egg cell , determining whether the baby will be female ( XX ) or male ( XY ) . To be female , one needs to be ( XX ) , whereas to be a male , ( XY ) is needed . It is the Y chromosome that is essential for the development of the male reproductive organs , and with no Y chromosome , an embryo will develop into a female . This is because of the presence of the sex determining region of the Y chromosome , also known as the SRY gene . </P>
<P> A baby 's sex is determined at the time of conception . When the baby is conceived , a chromosome from the sperm cell , either X or Y , fuses with the X chromosome in the egg cell , determining whether the baby will be female ( XX ) or male ( XY ) . To be female , one needs to be ( XX ) , whereas to be a male , ( XY ) is needed . It is the Y chromosome that is essential for the development of the male reproductive organs , and with no Y chromosome , an embryo will develop into a female . This is because of the presence of the sex determining region of the Y chromosome , also known as the SRY gene . </P>
when did you become genetically male or female
when did you become genetically male or female
at the time of conception
at the time of conception