Sea urchin egg undergoing feralizaaon and acavaaon 5

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Unformatted text preview: nt of all animals As many as 50% of the genes in worms, flies, or fish are also present in humans and carry out similar funcAons 4 3/25/12 Major events of embryonic development Embryogenesis FerAlizaAon unites two haploid genomes to form the zygote FerAlizaAon ac3vates the egg, iniAaAng the process of embryogenesis. Sea urchin egg undergoing ferAlizaAon and acAvaAon 5 3/25/12 Cleavage is a special type of cell division in which cells do not grow Cells move from M to S without stopping for G1 or G2. Cleaving cells have a special name: blastomeres Frog embryo At the end of cleavage the embryo is called a blastula* blastomeres blastula Sea urchin embryo *blastodisc (birds, fish), blastocyst (mouse and human), blastoderm (insects) 6 3/25/12 The blastula then undergoes a dramaAc reorganizaAon called gastrula3on "It is not birth, marriage, or death, but gastrulaAon, which is truly the most important Ame in your life." Lewis Wolpert (1986) GastrulaAon creates three germ layers ectoderm endoderm mesoderm 7 3/25/12 GastrulaAon in a frog Cross ­secAon “morphed...
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This note was uploaded on 04/18/2012 for the course BIOMG 1350 taught by Professor Bretscher during the Spring '12 term at Cornell.

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