02.05.2013 Views

Evolution__3rd_Edition

Evolution__3rd_Edition

Evolution__3rd_Edition

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

..<br />

Study and review questions<br />

1 Draw the frequency distribution for the selection<br />

coefficients of the genetic variants at a locus, according<br />

to the neutral and the selectionist theories of molecular<br />

evolution.<br />

2 Why is the neutral theory confined to molecular<br />

evolution, rather than being applied to all evolution?<br />

3 What facts about molecular evolution led to the<br />

proposal of the neutral theory of molecular evolution?<br />

4 What facts about molecular evolution led to the<br />

proposal of the nearly neutral theory of molecular<br />

evolution?<br />

5 Explain the relation between the degree of functional<br />

CHAPTER 7 / Natural Selection and Random Drift 193<br />

constraint on a molecule (or region of a molecule) and its<br />

rate of evolution by (a) the neutral theory, and (b) natural<br />

selection.<br />

6 Do synonymous sites show pan-neutral evolution?<br />

What evidence is there bearing upon the answer?<br />

7 Three genes have ratios of<br />

Rate of non-synonymous substitution<br />

Rate of synonymous substitution<br />

of (a) 0.2, (b) 1, (c) 10. What inferences can we make<br />

about the evolution of these three genes?

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!