State concisely one conserved mechanism that an embryo use to establish its primary axis (anterior to...
State concisely one conserved mechanism that an embryo use to establish its primary axis (anterior to posterior axis).
Homework Answers
The anterior-posterior axis is
a line that runs from the head to the tail of an organism. The
Anterior-Posterior (AP) axis is the first embryonic axis to arise
in evolution. AP axis allows animals to move
unidirectionally.
Establishment of the AP axis is an essential step in the
development of all bilaterian animals. However, the mechanisms by
which this occurs can differ significantly between animal clades.
Drosophila is an excellent example of AP specification. It
utilizes both highly conserved and divergent mechanisms during this
process. Axis polarity is established in the Drosophila
egg well before it is fertilized, during the process of oogenesis
when the oocyte moves to the posterior of the egg chamber. This is
in contrast to vertebrate development, where the establishment of
AP occurs during early development. The development of AP polarity
is a crucial process in the mouse because it takes place as the
embryo implants within the mother. In the case of mouse, it is
believed that the uterus could play a key role in positioning this
future body axis.
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State concisely one conserved mechanism that an embryo
use to establish its primary axis (anterior to...
Developmental Biology How is the anterior-posterior axis of neuroectoderm specified in amphibians or fish (pick one)?...
Developmental Biology
How is the anterior-posterior axis of neuroectoderm specified in amphibians or fish (pick one)? What key molecules are involved? Feel free to discuss manipulations such as knockouts that have provided evidence. Note that this is referring to the neuroectoderm, not the entire A-P axis of the organism.
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Developmental Biology
How is the anterior-posterior axis of neuroectoderm specified in amphibians or fish (pick one)? What key molecules are involved? Feel free to discuss manipulations such as knockouts that have provided evidence. Note that this is referring to the neuroectoderm, not the entire A-P axis of the organism.
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