Eyes and optic tectums grow at different rates.As they grow,the synaptic connections that were originally formed on the tectum by axons of retinal ganglion cells shift so that the retina is always fully and faithfully mapped on the tectum.This finding supports the
A) chemoaffinity hypothesis.
B) pioneer hypothesis.
C) topographic-gradient hypothesis.
D) all of the above
E) both A and C

Question

Quizplus · Accepted Answer

The finding that the retina is always fully and faithfully mapped on the tectum as they grow suggests that the topographic-gradient hypothesis is supported. This hypothesis proposes that neighboring areas of the retina project to neighboring areas of the tectum in an orderly manner, forming a map of the visual field.

Eyes and Optic Tectums Grow at Different Rates