Lecture 41 DevelMechs_1TO POST slides

Lecture 41 DevelMechs_1TO POST slides - Two Principles of...

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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; Fig. 21.14; 420; 425 (bottom) - 427; 1005-1006
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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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In normal development: organizer cells induce development of other
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Lecture 41 DevelMechs_1TO POST slides - Two Principles of...

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