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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