Close Encounters of The Zygotic Kind. Investigations of Polyspermy in Sea Urchins. Just's 1919 Work in Sea Urchin Fertilization Membrane Formation. Birds Don't do it.
Bees do and so do some Snakes.
Cleavage And Blastula Formation Photos of Human Egg fertilized and unfertilized, Cleavage stages, Blastocyst, Implantation Virtual Embryology Movies of dissected embryos. Must have Movie Play back Program on Your Machine. Explain the developmental stratagies of Oviparity, Ovoviviparity, and viviparity and give examples of each. Explain Holoblastic, Equal and Unequal. Explain Superficial and Discoidal Cleavage.