The difference between primary and secondary induction is a difference between
A) "hard-wired" commands and chance development.
B) effects of the dorsal lip organizer and effects of the subsequent cell's induction.
C) nuclear and cytoplasmic determinants.
D) homeotic pattern formation and regular structural gene effects.
Correct Answer:
Verified
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
Q22: The allantois
A)becomes the chorionic villi.
B)lies next to
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
Q28: Which of the following is NOT characteristic
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