CMMB403 Final Exam Questions and Answers 100% Solved
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Course
CMMB403
Institution
CMMB403
CMMB403 Final Exam Questions and
Answers 100% Solved
72 hours (8 cells) (BEFORE BLASTOCYST STAGE) - what is the
human MZT
Mid-blastula transition/maternal-zygotic transition - when the
transcription of zygotic genes begins and maternal mRNAs are degraded,
the cell cycle lengthens, gap stages ...
Parasegments - ✔✔transient subdivisions that occur in the Drosophila
embryo prior to the formation of segments - are off register by one half from
those of the segments, is made up of the cells in the posterior compartment
of one segment and the anterior compartment of the next segment. the
expression patterns of early segmentation genes are at THESE boundaries
- is the "fundamental unit of embryonic expression"
kruppel - ✔✔gap gene expressed in parasegments 4-6, is repressed by
hunchback, if mutated will be missing several segments in a row (4-6ish)
fushi tarazu (ftz) - ✔✔pair rule gene in drosophila that is expressed in even
# parasegments, if mutated results in no boundaries btw parasegments and
reduced (by half) segment number from 14 to 7
even-skipped (eve) - ✔✔pair rule gene in drosophila that is expressed in
ODD # parasegments, if mutated results in no parasegment boundaries
and reduced segment number from 14 to 7
engrailed (en) - ✔✔segment polarity gene expressed in cells w high [ ] of
either even skipped or fushi tarazu proteins, is a hedgehog pathway
regulator that marks the anterior compartment of each parasegment (which
is also the posterior part of each segment) - this reinforces parasegment
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