Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 19, Problem 4Q
Summary Introduction
To review:
The way for testing whether Hox gene was responsible for differences between species 3 and species 1 and 2.
Introduction:
The hairball expression is regulated by a Hox gene in species 1 and 2. Another species 3 had a variant of gene that is differed by one
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The two general steps that are required for a new
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Suggest a possible reason why species in the green algal lineage may have been more likely to colonize land than species in the red algal lineage.
Volvox carteri, an volvocine alga, has approximately 2000 somatic cells and only 16 reproductive or germ line cells. The observation that multicellular individuals, like Volvox, have a much smaller subset of germ line cells compared to somatic cells appears to be general rule. Which of the following is the best evolutionary explanation for why this is the case?
A) Organisms can biologically only contain a small number of germ line cells as they are always larger than somatic cells.
B) Multicellular individuals with a germ line vs. somatic cell line differentiation only evolved a single time, thus all members of this lineage share the same scheme of more soma cells with a much smaller subset of germ line cells.
C) Having a smaller subset of reproductive cells helps reduce the likelihood of cheating from evolving, which in turns prevents the collapse of the multicellular individual system.
D) None of the above.
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Life: The Science of Biology
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