How the sperm reaches to the egg?
Sperms come out through ejaculation. They get collected in vagina near the mouth of cervix. They swim and reach to egg.
How does a sperm penetrate an egg through the defence barrier of the egg?
The sperms bearing X chromosome reach the egg faster than the sperms bearing Y chromosome.
How do the sperms penetrate the egg through the defence barrier of the egg?