Positional Information in Development Often Comes from _______, Substances That

question 37

Short Answer

Positional information in development often comes from _______, substances that diffuse from one group of cells, setting up a concentration gradient.

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Definitions:

Classical Conditioning

An educational process where two stimuli are consistently coupled together; a reaction initially provoked by the second stimulus is ultimately triggered by just the first stimulus.

Unconditioned Stimulus

In classical conditioning, a stimulus that naturally and automatically triggers a reflexive response without the need for prior learning.

Conditioned Response

A learned response to a previously neutral stimulus that has become conditioned through association with an unconditioned stimulus.

Conditioned Stimulus

An originally neutral stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response.