Explain how segments are established in the Drosophila embryo
please be detailed and use exact names for components involved
All arthropods, are segmented. The body of Drosophila is built
from 14 segments:
3 segments make up the with its antennae and mouth parts.
3 segments make up the . Each thoracic segment has a pair of legs
(insects are the six-legged creatures).and the middle thoracic
segment carries a single pair of wings.
The hind segment a pair of halteres.8 .
signals guide segment formation----->
The process begins with the gradients of messenger RNA (mRNA) that
the mother deposited in her egg before it was fertilized.
Shortly after fertilization, these are translated into their
proteins with
●a gradient of bicoid diminishing from anterior to posterior
and
●a gradient of nanos diminishing from posterior to anterior.
●Bicoid protein is a transcription factor. It binds to the promoter
of a gene called hunchback, turning it ON.
● Nanos protein binds to hunchback mRNAs, inhibiting their
translation.
These effects combine to produce a high level of hunchback protein
at the anterior of the embryo; with a sharp cut-off toward the
posterior.The hunchback protein is also a transcription factor (as
we shall see).
These concentration gradients regulate the turning on and off of
other genes in sharply-defined regions of the embryo.These
establish the various segments of the body
Explain how segments are established in the Drosophila embryo please be detailed and use exact names...
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Exact Values except when the
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Please show detailed arrow-pushing
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Best regards.
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