1 Classical Stages of Early Development

1 Classical Stages of Early Development - Animal...

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Animal Development (3 lectures) Lecture 1: classical stages of early development Lecture 2: mechanisms of cellular differentiation Lecture 3: new applications and recent research in developmental biology
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Model Organisms for Studying Developmental Processes
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Classical Stages of Early Development Fertilization- making the zygote Cleavage division - subdivision of zygote Gastrulation -formation of embryonic germ layers Organogenesis - organ building
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Fig. 47.3 Basal body (centriole) Sperm head Sperm-binding receptors Acrosome Jelly coat Vitelline layer Egg plasma membrane Hydrolytic enzymes Acrosomal process Actin filament Sperm nucleus Sperm plasma membrane Fused plasma membranes Fertilization envelope Cortical granule Perivitelline space EGG CYTOPLASM Fertilization in Sea Urchins
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Fig. 47.6 (a) Fertilized egg (b) Four-cell stage (c) Early blastula (d) Later blastula Cleavage in a Sand Dollar Embryo blastomeres blastocoel
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Fig. 47.8 Blastula (cross section) Blastocoel Animal pole 4-cell stage forming 2-cell stage forming Zygote 8-cell stage Vegetal pole 0.25 mm 0.25 mm Cleavage in a Frog Embryo
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Cleavage Patterns holoblastic holoblastic meroblastic superficial
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1 Classical Stages of Early Development - Animal...

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