A) The trophoblast gives rise to the embryo proper.
B) Maternal genes are expressed during cleavage.
C) The blastocyst implants in the mother's uterus.
D) Early mammalian development is slow.
Correct Answer: A
Solution :
[a] In the mammalian blastocyst, the trophoblast forms the foetal part of the placenta. A disc-shaped portion of the inner cell mass surrounded by the trophoblast becomes the embryo.
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