Frog Blastula 1.area of mitosis 2.blastocoel 3.cortical layer
4.cortical layer 5.area of invagination (opposite area of sperm
entrance A = anterior P = posterior
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Slide 9
Frog Early Gastrula yolk plug Ventral Dorsal Archenteron
endoderm ectoderm
Slide 10
Frog Late Gastrula 1.Ectoderm 2.Endoderm 3.Mesoderm
4.Blastocoel 5.Archenteron 6.Dorsal lip of blastopore 7.Blastopore
8.Ventral lip of blastopore 9.Yolk plug A = anterior P = posterior
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