The conclusion of Spemann's work,in which he tied off a zygote isolating the nucleus on one side and only cytoplasm on the other,helped prove
A) origin of the coelom.
B) nuclear equivalency.
C) cytoplasmic specification.
D) embryonic induction.
Correct Answer:
Verified
Q20: In animals,indirect development
A)occurs only in mammals.
B)lacks a
Q21: When the central mass of yolk restricts
Q22: The allantois
A)becomes the chorionic villi.
B)lies next to
Q23: The difference between primary and secondary induction
Q24: The placenta develops from
A)fetal membranes only.
B)maternal tissue
Q26: Neighboring cells influence the development of each
Q27: The special blastomere labeled the 4-d cell
Q28: Which of the following is NOT characteristic
Q29: The internal pouch representing the developing gut
Q30: An enterocoelous animal has
A)a true coelom.
B)a pseudocoelom.
C)no
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