Exam 7: Life-Span Development of the Brain and Behavior

_______ produce myelin, which surrounds the axons of neurons and speeds conductance of electrical signals.

In fragile X syndrome, the presence of _______ trinucleotide repeats in the fragile site of the X chromosome results in mental retardation.

In a frog, the segregation of inputs from two eyes that are forced to innervate a single optic tectum requires

What factors are thought to guide migrating cells in the developing brain?

The pattern of regeneration of the frog visual system supports the _______ hypothesis proposed by Sperry.

The structural defect found in weaver mutant mice results from failure to

Cognitive impairment in Alzheimer's patients is most closely correlated with

It appears that Alzheimer's disease is not simply the result of "wear-and-tear," because

Using data derived from studies of sensory deprivation, illustrate the principle that environmental inputs are essential to the organization and proper functioning of neural systems.

In embryonic development, the layer the nervous system arises from is the _______.

Lead poisoning in an infant, which destroys newly forming myelin, would mostly affect the

Write a coherent and informative paragraph incorporating each of the following terms or concepts: growth cones; filopodia; chemoattractants; chemorepellents; axons; dendrites

Citing experimental evidence, describe how the synaptic targets of developing neurons regulate cell death.

Spinal cord cells are induced to develop as motor neurons under the influence of the

Radial glial cells stretch between the _______ and _______ surfaces of the developing nervous system.

Give an overview of experimental results that support Sperry's chemoaffinity hypothesis. In the case of the innervation of the optic tectum of frogs by retinal fibers, how are these connections "fine-tuned"?

Diablo ultimately causes apoptosis because

Each senile plaque within the brains of patients with Alzheimer's disease contains

Grafting an extra leg onto a developing tadpole or chick results in an increased _______ of _______.

Certain growing axons are prevented from crossing the midline by the _______ action of the protein _______.