Chapter 28, Problem 1RC

What would be the fate of an embryo if the chorion failed to form properly?

(a) There would be an insufficient number of blood cells formed, and the infant would need a transfusion at birth.

(b) There would be no effect; the allantois would assume the function.

(c) There would be no protective cushion of fluid surrounding the embryo, which would be subjected to injury within the uterus.

(d) The embryo would be unable to receive nutrients and oxygen in sufficient amounts, and the pregnancy might terminate spontaneously.