During Week 1, cells multiply on the outside of the egg surface, forming layers that will generate all of the following EXCEPT

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Multiple Choice

During Week 1, cells multiply on the outside of the egg surface, forming layers that will generate all of the following EXCEPT

Explanation:
Week 1 sets up two key cell populations: the outer layer (trophoblast) and the inner cell mass. The trophoblast contributes to the formation of fetal membranes (such as the amnion and chorion) and helps establish the placenta, while the inner cell mass becomes the embryo proper. Muscle tissue, however, arises later when the mesoderm forms during gastrulation, which occurs after Week 1. So the structure that does not arise from these early Week 1 layers is muscle tissue.

Week 1 sets up two key cell populations: the outer layer (trophoblast) and the inner cell mass. The trophoblast contributes to the formation of fetal membranes (such as the amnion and chorion) and helps establish the placenta, while the inner cell mass becomes the embryo proper. Muscle tissue, however, arises later when the mesoderm forms during gastrulation, which occurs after Week 1. So the structure that does not arise from these early Week 1 layers is muscle tissue.

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