In amphibian eggs, cells migrate to the interior of the embryo through the blastopore. In mammalian embryos with small amounts of yolk, this involution occurs at the

Question

Quizplus · Accepted Answer

The involution of cells through the blastopore occurs in amphibian eggs, which have a significant amount of yolk. However, in mammalian embryos with small amounts of yolk, this involution occurs at the primitive groove. The notochord and gray crescent are structures found in amphibian embryos, and while the blastopore is involved in involution in some embryos, it is not the case in mammalian embryos. Therefore, the best choice is B, primitive groove.

In Amphibian Eggs, Cells Migrate to the Interior of the Embryo