IB35ACS Study Guide

Conclusions for today o genetic diversity can be

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: id light skin evolve? ▪ ▪ Migration away from equator Women are lighter because they have to produce much vitamin D during reproduction (“knife’s edge” of natural selection) o 26 genes involved in determining skin color ▪ KITLG (kit ligand) ● Strong selection for lighter pigmentation ● Europeans and East Asians ● convergence/conserved mechanism in humans and fish ▪ MC1R- regulates melanin production ● Little variation in African but much in European o Pigment in the Neanderthals ▪ Amplified sequence fragment from 2 Netherlands remains ▪ Both have a mutation not found in the 3700 humans studied ▪ Mutation impairs function of MC1R ▪ EVIDENCE OF CONVERGENCE o Genes influencing variation in skin pigmentation ▪ DCT- evidence of selection in a Chinese population ▪ MATP, SLC24A5, OCA2, and TYRP1 show evidence of European selection. o Parallel evolution ▪ Light skin has evolved at least 2 times independent of each other ▪ Light skin of Europeans and Asians is ex of evolutionary convergence ● Conclusio...
View Full Document

This document was uploaded on 03/11/2014 for the course IB 35AC at Berkeley.

Ask a homework question - tutors are online