The allantois
A) becomes the chorionic villi.
B) lies next to the shell in chicks.
C) is a structure composed of two germ layers.
D) gives rise to umbilical blood vessels in humans.
Correct Answer:
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Q17: The effect of yolk on cleavage is
Q18: Before fertilization,as an egg cell matures,its nucleus
Q19: Generally,only one sperm fertilizes an egg because
A)there
Q20: In animals,indirect development
A)occurs only in mammals.
B)lacks a
Q21: When the central mass of yolk restricts
Q23: The difference between primary and secondary induction
Q24: The placenta develops from
A)fetal membranes only.
B)maternal tissue
Q25: The conclusion of Spemann's work,in which he
Q26: Neighboring cells influence the development of each
Q27: The special blastomere labeled the 4-d cell
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