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4. Animal reproduction and development
Gamete formation, fertilization
This site has a good tutorial on gamete formation and fertilization. If you want to look at the pictures then copy and paste the URL’s that they are referencing. This is a pretty good tutorial although quite a bit of advertising on the page and would be better if pictures were not broken.
A short answer from yahoo that briefly define gamete formation, fertilization and some other terms you will need to know for this section.
Cleavage, gastrulation, germ layer formation, differentiation of organ systems
This page has a list of vocabulary words that you will probably come across in this section. A good reference guide for all the stuff you will be reading in these topics. This site also has some practice questions to help you study.
You may have already read this page in a previous section but at the bottom it covers the rest of cleavage and the other topics you should be studying.
Experimental analysis of vertebrate development
Extraembryonic membranes of vertebrates
Formation and function of the mammalian placenta
This page is mainly point form but goes over the vocabulary you will need for these topics in a thorough manner.
Pinkmonkey has a good guide on reproduction that covers some of the topics you will need for this section.