Animal development fertilization sperm must pass through 3 barriers o 1 jelly coat o 2 vitelline layer o 3 plasma membrane o embryology study of development of the embryo 5 major stages 1 gametogenesis gamete production ie meiosis 2 fertilization union of sperm egg cell 2n zygote 3. Embryology is the study of early cellular development in human or animal embryos embryology is often featured as an elective class at the undergraduate or graduate degree levels
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