Is it a sperm cell that eventually grows into a human baby, or is it the ovum that is, in essence, a baby that isn't yet born?
A sperm carries either an X or Y chromosome, while an egg only carries an X chromosome. When the two pair, the chromosome carried by the SPERM determines whether it is a boy or a girl. XX - Girl XY - Boy
109,966 questions
120,669 answers
1,365 comments
7,058,873 users