PSYCH 439 Chapter 3 Exam with Questions and Answers
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Course
PSYCH 439
Institution
PSYCH 439
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...
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
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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