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One Difference Between Early Development in Humans and in Xenopus

Question 22

Multiple Choice

One difference between early development in humans and in Xenopus (frogs) 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

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