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toripotent
cell that has the potential to develop into any cell type
determination
cell becomes committed to a particular cell fate
cloning experiments
supported hypothesis that all cells contain same genetic material, but different genes are expressed, the development requires selective expression
what are the development stages of fruit flies (drosophilia)
embryo»three larval stages»adults (different genes influence development at each stage)
syncytium
multinucleate cell
syncytium blastoderm
nuclei migrate to edge of cell and divide
cellular blastoderm
cell membrane grows around each cell nucleus
primordial germ cells
nuclei at one end of blastoderm
3 steps to embryo development
1.) establish axes (either dorsal-ventral or posterior-anterior)
2.) number of segments and orientation of body segemnts
3.) determine identity of each segment