Test: GRE Subject Test: Biology

1.

During gastrulation, the developing embryo undergoes a reorganization of the cells into a multi-layered organism, with each layer necessary to form distinct parts of the eventual fully-formed organism. Which of these primary layers will ultimately form the skin and the nervous system of the organism? 

Vegetal pole

Endoderm

Ectoderm

Mesoderm

Blastopore

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