INTEGRATED PRINC.OF ZOOLOGY(LL)(FD)
17th Edition
ISBN: 9781260704310
Author: HICKMAN
Publisher: MCGRAW-HILL CUSTOM PUBLISHING
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Textbook Question
Chapter 8, Problem 9RQ
Using sea star embryos as an example, describe gastrulation. Explain how the mass of inert yolk affects gastrulation in frog and bird embryos.
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"One of the symmetry breaking events in mouse gastrulation requires the amplification of Nodal on the side of the embryo opposite to the Anterior Visceral Endoderm (AVE). Describe one way by which Nodal gets amplified in this region."
My understanding of this is that there are a few ways nodal is amplified though I'm not sure if this is specifically occurs on the opposite side of the AVE.
1. pronodal cleaved by protease -> active nodal
2. Nodal -> BMP4 -> Wnt-> nodal
3. Nodal-> Nodal, Fox1 binding site
4. BMP4 on outside-> nodal
Are all of these occuring opposite to AVE?
If four babies are born on a given day What is the chance all four will be girls? Use genetics laws
Chapter 8 Solutions
INTEGRATED PRINC.OF ZOOLOGY(LL)(FD)
Ch. 8 - What is meant by epigenesis? How did Kaspar...Ch. 8 - How is an egg (oocyte) prepared during oogenesis...Ch. 8 - Describe events that follow contact of a...Ch. 8 - What is meant by the term activation in...Ch. 8 - How does amount of yolk affect cleavage? Compare...Ch. 8 - What is the difference between radial and spiral...Ch. 8 - What other developmental hallmarks are often...Ch. 8 - What is indirect development?Ch. 8 - Using sea star embryos as an example, describe...Ch. 8 - What is the difference between schizocoelous and...
Ch. 8 - Describe two different experimental approaches...Ch. 8 - What is meant by induction in embryology? Describe...Ch. 8 - What are homeotic genes and what is the homeobox...Ch. 8 - What is the embryological evidence that...Ch. 8 - What are the four extraembryonic membranes of...Ch. 8 - What is the fate of the four extraembryonic...Ch. 8 - Explain what the growth cone that Ross Harrison...Ch. 8 - Name two organ-system derivatives of each of the...Ch. 8 - Prob. 19RQCh. 8 - SCNT makes possible therapeutic cloning. What are...
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Embryology | Fertilization, Cleavage, Blastulation; Author: Ninja Nerd;https://www.youtube.com/watch?v=8-KF0rnhKTU;License: Standard YouTube License, CC-BY