Lab Manual for Biology
Lab Manual for Biology
12th Edition
ISBN: 9781259298516
Author: Sylvia S. Mader Dr.
Publisher: McGraw-Hill Education
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Chapter 15, Problem 1TS

Mutations occur at random and can increase within a population for no particular purpose. Our immune system is capable of detecting and killing certain viruses. Would a virus, such as HIV, that has a frequent rate of mutation be more or less successful in avoiding the immune system? Explain.

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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
Explain each punnet square results (genotypes and probabilities)
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Mitochondrial mutations; Author: Useful Genetics;https://www.youtube.com/watch?v=GvgXe-3RJeU;License: CC-BY