At conception, gender is determined by chromosome characteristics - and it will be the male

At conception, gender is determined by chromosome characteristics - and it will be the male
(or rather the male's sperm) that dictates whether the baby will be a boy or a girl.
Prior to conception, the unfertilized egg carries an X chromosome while the sperm can carry either an X or a Y chromosome. The gender of the baby comes down to onesimple event :
*. If the sperm carrying an X chromosome fertilizes the egg, a girl will be conceived.
*. If the sperm carrying a Y chromosome fertilizes the egg, a boy will be conceived.