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The amnion of mammalian embryo is derived from

1. ectoderm and mesoderm
2. endoderm and mesoderm
3. ectoderm and endoderm
4. mesoderm and trophoblast

Correct answer: ectoderm and mesoderm

Solution

The amnion is an extraembryonic membrane formed by amniotic ectoderm and surrounding extraembryonic mesoderm. Endoderm contributes to the yolk sac and gut lining, not the amnion.

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