CSB328H1 Chapter Notes - Chapter 8: Microtubule, Paracrine Signalling, Nieuwkoop
22 Oct 2013
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Chapter 8 early development in vertebrates: amphibians and fish. Despite vast differences in their adult morphology, the early development of each of the vertebrate groups is very similar. Fish and amphibians are 2 of the most easily studied vertebrates. They are anamniotic vertebrates do not form an amnion that permits embryonic development to take place. In both, hundreds of eggs are laid externally and fertilized simultaneously on dry land. They generate body axes and organs employing many of the same processes and genes used by other vertebrates, including humans. Salamander and frog embryos - large cells and rapid development. But they undergo a long period of growth before they become fertile and chromosomes are often found in several copies -> precluding easy mutagenesis. Frogs usually have external fertilization, with the male fertilizing the eggs as the female is laying them.
