The developmental signal _______ directs the development of the ventral portion of the spinal cord, and _______ directs the development of the dorsal portion of the spinal cord.
A) Sonic hedgehog; bone morphogenetic protein
B) retinoic acid; Sonic hedgehog
C) bone morphogenetic protein; Sonic hedgehog
D) Sonic hedgehog; retinoic acid
Correct Answer:
Verified
Q15: The structurally distinct swellings in the developing
Q16: Ephrins are _ that affect gene expression
Q17: Exposure to _ prevents the posterior neural
Q18: Which developmental signal is also a powerful
Q19: If a vertebrate embryo develops an enlarged
Q21: Sonic hedgehog is secreted from the
A) neural
Q22: Bone morphogenetic protein is secreted from the
A)
Q23: An animal can be born with a
Q24: If the anterior-posterior axis of the spinal
Q25: In the evolution of the human brain
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