Exam 4: Neural Differentiation

In vertebrate development, the notochord secretes _______, which induces formation of the _______ plate.

An injury that causes Schwann cells to become melanocytes is an example of

What happens to the development of the Drosophila compound eye if the sevenless gene is dysfunctional?

If the hedgehog gene was nonfunctional in a developing Drosophila, what might happen to the morphogenetic furrow in eye development?

Which mechanism causes a postmitotic cortical neuron to settle in a particular layer depending on when it was born?

Early in the developing Drosophila eye, cells next to the posterior eye disc release _______ to direct adjacent cells to differentiate into _______.

If sweat gland tissue from a rat is transplanted into to the back, which neurotransmitter will the sympathetic fibers in the back that subsequently innervate the newly transplanted sweat gland tissue release? What does this tell us about the differentiation of sympathetic fibers, particularly those that innervate sweat glands?

What is responsible for the expanded neocortex in humans?

Neural tube cells that will become motor neurons first express the gene _______, which makes a protein that turns on the expression of _______.

The cell membrane factor _______ induces postmitotic cells to become _______.

What are the three broad types of pathways in which differentiating cells are influenced by other cells? What is the final common mechanism by which all of these pathways influence cell fate?

Which comes first in the process of spinal motor neuron differentiation?

What process drives the compound eye of Drosophila to develop from a uniform disc of cells?

_______ is the phenomenon whereby a descendant species stops development at what was a juvenile stage in its ancestor.

What is the last region to mature in human brain development?

In what way are the neural crest cells that become the sympathetic neurons anatomically segregated from those that become the parasympathetic neurons?

How does the bacterium responsible for Hansen's disease lead to the dedifferentiation of Schwann cells, and how does this cause the symptoms of the disease?

Early in development, postganglionic neurons in the autonomic nervous system release

In vertebrate development, the overlying ectoderm secretes _______, which induces formation of the _______ plate.

Refer to the figure. Based on the data shown, which compares brain weight during development in humans and chimpanzees, what can you conclude about the similarities and differences between human and chimpanzee brain development outside the womb? What brain difference in adulthood results from these developmental differences?