Occur to the oviduct. Sperm release enzymes from acrosome to degradation of compounds the egg cell. Push the nucleus of itself (n) into induce secondary oocyte (metaphase II) to complete cell division. Egg cell (n)with sperm(n) = 2n call “Zygote” and sperm induce egg cell emissions from between the egg membrane with vitelline membrane out. A thick layer call “Fertilization membrane” prevents penetration by other sperm.