Fertilization, this video will show you on how it works. Actually, it is an epic journey of a sperm. Sperms will make its way into a Fallopian tube and an only one strong sperm will burrow into the egg and fertilizes the egg. The egg changes so that no other sperm can get in.
At the instant of fertilization, your baby's genes,sex, hair colour and many other genetics factors are set. If the sperm has a Y chromosome, your baby will be a boy. If it has an X chromosome, the baby will be a girl.
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