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20: Development of the body plan Questions And Correct Detailed Answers 100% Verified.
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The pattern of neural structures in Xenopus that develop along the A-P axis is governed by signals of the ___ [D/V] mesoderm - correct answer The pattern of neural structures that develop along the A-P axis is governed by signals of the *dorsal* mesoder...

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  • August 30, 2024
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  • 2024/2025
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  • 20 development of the body plan

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20: Development of the body plan

The pattern of neural structures in Xenopus that develop along the A-P axis is governed by signals of the
___ [D/V] mesoderm - correct answer The pattern of neural structures that
develop along the A-P axis is governed by signals of the *dorsal* mesoderm



What happens if you take one neurula portion of the Xenopus mesoderm and graft it to another portion
of gastrula? - correct answer Anterior mesoderm grafted onto early gastrula =
extra head w eyes and forebrain



Posterior mesoderm grafted onto early gastrula = trunk and tail w spinal cord



What does the neurula mesoderm graft experiment show about Xenopus mesoderm? - correct answer
they are regional specific because where you take a piece of mesoderm determines what structure it will
give rise to



XENOPUS:

Where are qualitative antagonists secreted from along the A-P mesodermal axis? - correct answer
Wnt antagonists = anterior endoderm and mesoderm beneath future head



BMP antagonist = mesoderm beneath head and trunk



XENOPUS:

The level of Wnt/b-catenin signalling increase from ___ to ___ - correct answer
The level of Wnt/b-catenin signalling increase from *anterior to posterior*



XENOPUS:

How does the inhibition of Wnt or BMP contribute to prospective head/trunk regions? - correct answer
Head = Inhibition of Wnt and BMP

Trunk = inhibition of BMP

, What is the prechordal plate? - correct answer indicates future cranial region
of embryo (organizer of the head)



What is the final body plan of the Xenopus embryo in terms of the fates for the three germ layers? -
correct answer Mesoderm - gives rise to prechordal plate, notochord, somites,
lateral plate mesoderm



Endoderm - moved inside to line gut



Ectoderm - neural tube formed while epidermis covers the entire embryo



XENOPUS:

When does the final body plan emerge during development? - correct answer
During gastrulation and neurulation



CHICK:

Start of the primitive streak marks the ___ [P/A] end of the embryo? - correct answer
Start of the primitive streak marks the *posterior* end of the embryo



Chick:

In what direction does the streak elongates and what forms at the end of the streak? - correct answer
elongates anteriorly with the node forming at the anterior end



Chick:

When does the zygotic gene activation occur? - correct answer late cleavage
stage



What is the area pellucida? - correct answer single layer of epiblast cells
overlying a subgerminal space w layer of hypoblast cells on floor of cavity



what is the area opaca? - correct answer Area of deeper cells, does not form
the embryo

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