For Wednesday:

• Work through example of Bayesian thinking (here).
• Does selection still play a role in human evolution? Read abstracts (or more) of articles on Natural selection in a contemporary human population, Natural and sexual selection in a monogamous historical human population, and Measuring selection in contemporary human populations.
• Read Wikipedia entry on Toxoplasma and behaviour
• Take home exam #7 is due

If time,

• listen to radiolab on parasites
• Do STDs increase frequency of behavious that leads to transmission?
• Does the same apply at the gene level? Do HEs that relay on "sex" of the host, impact sex frequency? (see here)

Slides for today (and Wednesday :)) on Friday's LBA exercise, population genetics overview, role of HGT in evolution, types of selection.

Goals class 21

• Know what the terms positive, negative, and neutral selection mean and what frequent synonyms for these terms are.
• Know how to infer the type of selection using synonymous and non-synonymous substitutions.
• Know that one can infer the type of selection from the rate with which a gene goes to fixation.
• Be able to discuss the terms positive and diversifying selection

Goals class 20

• Know the difference between mutation and substitution.
• Understand why for neutral mutations the mutation rate equals the substitution rate.
• Understand that even with very large populations, most mutations that provide a small selective advantage go extinct due to genetic drift.
• Understand how population size impacts the time it takes for fixation of a neutral mutation