The mesoderm associated with the allantois spreads to cover the entire inside of the trophoblast. This combination of mesoderm and trophoblast is the ________.
A) chorion
B) allantois
C) mesoderm
D) blastodisc
E) yolk sac

Question

Quizplus · Accepted Answer

The mesoderm and trophoblast together form the chorion, which is the outermost membrane surrounding the embryo or developing fetus. The allantois is a structure that grows out of the embryo and plays a role in waste disposal, but it does not contribute to the formation of the chorion. Mesoderm is one of the three primary germ layers that give rise to all the tissues and organs of the body, but it is not the same as the chorion. The blastodisc is the early stage embryo before it forms a blastula, and the yolk sac is another extra embryonic structure that forms during development.

The Mesoderm Associated with the Allantois Spreads to Cover the Entire