Lec41s - Two Principles of Development 6th ed.: 402-406;...

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Two Principles of Development 6 th ed.: 402-406; Fig. 21.12; 419-420; 1015-1017 7 th ed.: 411-414, 420, 425-427;1005-1006 8 th ed.: 367-368, 372, 1038-1041 + scanned C. elegans figure
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A key principle in development: Induction Some cells affect the development of other cells.
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Dorsal = side closest to backbone Ventral = opposite side; closest to belly ventral dorsal
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Dorsal lip of blastopore; on dorsal side at the end of gastrulation dorsal lip of blasto- pore
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Cells at dorsal lip of blastopore play crucial role in development. Called “Spemann’s organizer”. Forms at gastrulation.
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Experiment: transplant organizer cells to another gastrula; on the opposite side from the real organizer.
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Result: a 2nd embryo forms, attached to the first!
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Second embryo even contains some cells from the recipient gastrula. Cross-section; shows early spinal cord of both normal (primary) and secondary embryo. Spinal cord, primary embryo Secondary embryo; tan cells came from recipient
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Conclude: transplanted organizer directed development of the second embryo; and could even induce some cells of recipient to adopt a different fate!
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organizer cells induce development of other cells in the embryo; i.e. tell them how to develop.
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This note was uploaded on 09/23/2010 for the course BIO 202 taught by Professor Dean during the Fall '08 term at SUNY Stony Brook.

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Lec41s - Two Principles of Development 6th ed.: 402-406;...

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