Evidence for Evolutio6

Evidence for Evolutio6 - Evidence for Evolution Human...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Evidence for Evolution Human evolution Larry and I recently had a flamewar, er. .. scientific discussion about evolution in humans. I just saw a paper concerning human evolution in PNAS (Proceedings of the National Academy of Sciences) and thought I would summarize it. This bears only tangentially on that discussion. The authors of this paper (a bunch of people from Cavilli- Sforza's lab) set out to draw a phylogeny of 5 human populations and determine whether the differences in the populations were due to natural selection or genetic drift. They gathered data on 100 genetic polymorphisms from people from these 5 groups: two groups of African pygmies, Europeans, Chinese and Melanesians. A polymorphism is a trait (in this case a gene sequence) that is variable in a population. For example, eye color in humans is a polymorphisms. Phylogenies are drawn by comparing gene sequences and assuming that sequences more similar to each other are more closely related than sequences less similar to each other. [For a brief intro
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Evidence for Evolutio6 - Evidence for Evolution Human...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online