If a vertebrate embryo develops an enlarged posterior nervous system and little or no forebrain, what may have happened in development?
A) The embryo was over-exposed to fibroblast growth factor.
B) The embryo was over-exposed to retinoic acid.
C) The embryo was under-exposed to fibroblast growth factor.
D) The embryo was under-exposed to BMP.
Correct Answer:
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Q14: As vertebrate development proceeds, the hindbrain becomes
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
Q20: The developmental signal _ directs the development
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
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