Lecture 5 - L L L L L L L C , , L Marginal zone i Fig. 3.18...

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Lecture 5 Developmental Biology March 18 2008
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Fig. 3.5 Cleavage L of the Xenopus embryo Fig. 3.4 A late-stage Xenopus oocyte L
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Fig. 3.28 The future dorsal side of the amphibian embryo develops opposite the site of sperm entry as a result of the redistribution of dorsalizing factors by cortical rotation
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Infolding of cell sheet (eg. Drosophila mesoderm, Sea Urchin Endoderm) Inturning of cell sheet over an basal surface of an outer layer (eg. Amphibian Mesoderm) Migration of individual cells into the embyo (eg. Chick and mammalian mesoderm) Splitting or migration of one sheet into two sheets (eg. Mammalian and bird hypoblast formation) Figure 8.6 Types of cell movements during gastrulation. The expansion of one cell sheet over other cells (eg. Ectoderm formation in amphibians, zebrafish, And sea urchins)
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The Dorsal lip of blastopore C , in a Xenopus gastrula
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Fig. 3.6 Gastrulation in amphibians L
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Unformatted text preview: L L L L L L L C , , L Marginal zone i Fig. 3.18 Scanning electron micrograph of chick early somites and neural tube Fig. 3.60 A gradient in Nodal-related proteins (TGF family members) may provide the first two signals in mesoderm induction. Fig. 3.12 The development of a hens egg at the time of laying Fig. 3.13 Life cycle of the chicken Fig. 3.14 Cleavage and epiblast formation in the chick embryo Fig. 3.15 Ingression of mesoderm and endoderm during gastrulation in the chick embryo Fig. 3.16 Regression of Hensens node Fig. 3.17 Development of the neural tube and mesoderm in the chick embryo Fig. 3.19 Development of the chick embryo Fig. 3.34 Gravity defines the A-P axis of the chick. The posterior marginal zone develops a that side of the blastoderm which is uppermost and initiates the primitive streak...
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This note was uploaded on 09/03/2009 for the course BIO 503 taught by Professor Z.zyang during the Fall '09 term at Nanjing University.

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Lecture 5 - L L L L L L L C , , L Marginal zone i Fig. 3.18...

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