Sperry's initial version of the chemoaffinity hypothesis of axon growth has difficulty accounting for
A) the results of Sperry's own eye-rotation regeneration experiments.
B) the ability of axons to grow to their correct targets.
C) the ability of axons to follow exactly the same circuitous route to their target in every member of a species.
D) all of the above
E) both A and B
Question 2
Only those growth cones that are not pioneer growth cones can normally find their way to their targets by
A) chemoaffinity.
B) fasciculation.
C) blueprints.
D) topographic gradients.
E) stopping and asking for directions.
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