In humans, identical twins are possible because
A) of the heterogeneous distribution of cytoplasmic determinants in unfertilized eggs.
B) of interactions between extraembryonic cells and the zygote nucleus.
C) of convergent extension.
D) early blastomeres can form a complete embryo if isolated.
E) the gray crescent divides the dorsal-ventral axis into new cells.

Question

Quizplus · Accepted Answer

Early blastomeres can each form a complete embryo if they are isolated, making identical twins possible in humans. This is because each blastomere has the potential to develop into a full organism if given the appropriate signals and nutrients.

Note: Choices A, B, C, and E do not explain why identical twins are possible in humans.

In Humans, Identical Twins Are Possible Because