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Gastrulation

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Gastrulation

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    1. Gastrulation Definition = migration and division of cells to set up the 3 primary germ layers. What positions do presumptive germ layers occupy in the blastula, before gastrulation? Experimental answers to this question provide our basis for understanding cell movements that occur during gastrulation. FATE MAPS = diagram of blastula/blastodisc showing the fate of each part. Fate mapping technique developed by Vogt in 1920s. Involves Marking surface of blastula with vital dyes Dyes retained by cells for prolonged periods, but dont interfere with normal cellular processes Follow movements of marked cells during gastrulation to ultimate locations in later embryos

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