If a baby has a pair of X chromosomes, she’s a girl. If the baby inherits an X chromosome and a Y chromosome, he’s a boy. In birds, however, the …
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.