One difference between early development in humans and in Xenopus is that
A)in humans,there is no formation of the blastula;in Xenopus,the blastula is a critical stage in early embryogenesis.
B)in humans,blastocysts implant into the uterine wall;there is no implantation in Xenopus.
C)in humans,gastrulation is delayed as the egg moves along the fallopian tube;in Xenopus,gastrulation takes place immediately after blastula formation.
D)in humans,the yolk sac is much smaller than that seen in Xenopus.
E)in humans,neurulation occurs immediately after cleavage;in Xenopus,neurulation is delayed until after gastrulation.

Question

Quizplus · Accepted Answer

In humans, the blastocyst implants into the uterine wall, which is a critical step in early development. In contrast, Xenopus embryos develop externally in water and do not undergo implantation.

One Difference Between Early Development in Humans and in Xenopus