Exam (elaborations)
PSYCH 439 - Chapter 4 Questions and answers latest update
- Course
- PSYCH 439
- Institution
- Texas A&M University
PSYCH 439 - Chapter 4 Questions and answers latest update
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Solution 2024/2025Pepper
PSYCH 439 - Chapter 4 Questions and answers
latest update
cell-to-cell contact ANS✔✔ the fruit fly retina develops through orderly
progression of gene expression
starts w morphogenetic furrow - wave of dividing and differentiating cells in
eye from post to ant , leaving maturing neurons in wake
cells produce hedgehog (HH) - induces expression of DPP which STOPS
MITOSIS and starts proneural gene production (HH protein from one cell
communicates to the other cells to begin dpp expression)
photoreceptor R8 ANS✔✔ cluster of cells starts as homogenous
then overflow into adjacent cells
matures first (boss)
directs development of the other photoreceptors
order of recruitment for being differentiated!!!!
factors that influence whether a cell will be a neuron or a glia ANS✔✔
generation number (later cells are likely to be glia cells - intrinsic)
BMP (BMP after neural tube form = sets up dorsal/ventral boundary with
Shh - extrinsic)
notch/delta pathway (neural cells and rest are glial cells)
differentiation of motor neurons ANS✔✔ small changes in Shh concentration
can make big difference in cell differentiation
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