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PSYCH 439 Chapter 3 Exam with Questions and Answers
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PSYCH 439 Chapter 3 Exam with Questions and Answers how many neurons in human brain ANSWER 100 billion at its peak, a fetus can generate ____ new neurons per minute ANSWER 250,000 most neurogenesis occurs during _____, but some cells are added into adulthood ANSWER development pleiotrop...

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  • November 15, 2024
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  • 2024/2025
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PSYCH 439 Chapter 3 Exam with
Questions and Answers
how many neurons in human brain ANSWER 100 billion



at its peak, a fetus can generate ____ new neurons per minute ANSWER 250,000



most neurogenesis occurs during _____, but some cells are added into adulthood ANSWER
development



pleiotropy ANSWER when one gene affects many traits



ex: Shh affecting floor plate, motor nuerons, eye cups



redundancy ANSWER when many genes participate in a single process, and when loss of one
of the genes has little effect but knocking out 2 genes = cannot be carried out



ex: nog, chrdn, foll ---> neural plate differentiation



mitosis ANSWER process of cell division in which both resulting cells receive a full
complement of genetic material

restricted number of locations and time period

well established pattern, some cells divide many times and others leave to take on fates

ventricular surface



neuroblasts ANSWER divide and generate new cells

, - symmetric = 2 neuroblasts

- asymmetric = 1 neuroblast and 1 postmitotic daughter cell that leave ventricular zone in
neural tube



neurogenesis ANSWER process of dividing to produce cells that differentiate into neurons



in mitosis, cell nuclei shuffle from ____ to _____ ANSWER ventricular zone

pial surface



marginal zone ANSWER attached to pial surface, getting pushed higher and higher



asymmetric ANSWER m phase in ventricular zone

radial glial cells



symmetric ANSWER m phase in subventricular zone



radio-labeled thymidine ANSWER birthdating cells

injected into pregnant animal (taken up in utero)

cells in s phase of mitosis will take up the labeled nucleotide

animal grows up normally, brain is sliced and processed to determine location of marked
cells



BrdU ANSWER birthdating cells

a molecule similar to thymidine, taken up instead of thymidine during s phase

after animal grows up, can process tissue using ICC w antibodies for BrdU

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