All simulators
BiologyHeredity
Sex Determination in Humans
See how the father's chromosome decides the child's sex.
Controls
Live result
Mother's egg
Always X
Zygote
XX
Child
Girl
Probability at each birth
50 %
Sex determination — mother XX × father XYMother's egg: Always X
The father contributes X or Y, so the father's gamete determines the sex of the child.