Biological Anthropology Notes 8

Biological Anthropology Notes 8 - Biological Anthropology...

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: Biological Anthropology Notes November 17, 2006- Phylogenetic implications of primate molecular data- The Molecular clock o Estimating time of branching events o How does it work? Need a well dated branching event in fossil record Split between marsupials and placental mammals - 120 million years ago o Total evolutionary distance 2x time since last common ancestor Determine measure of difference in a protein or DNA strip Example such as marsupial or placental dog Determine rate of change in protein or DNA strip Rate = measure of difference / total evol. Distance 240 nucleotide differences / 240 million years = 1 diff./1 mil. Years Apply rate of change to estimate total evolutionary distance between other organisms Human and chimpanzee o 12 nucleotide diff. in gene X o 1 diff/1 million years = 12 differences / ? o 12 million years in total evolutionary distance Time since divergence =- half total evolutionary distance o 12 million years / 2 -= 6 million years Last common ancestor between chimp and human at 6 million years o Observations on molecular data Different molecular analyses generally agree on the evolutionary relationships between species Nucleotide sequencing is more precise Human-chimp split 6-7 million years ago Rates of change are protein/DNA strip specific Rate of change for any single protein/DNA strip is constant across closely related species Molecular DNA does not replace the fossil record- Johnathan Marks and Molecular anthropology o What does genetic difference mean?...
View Full Document

This note was uploaded on 04/05/2008 for the course ANTHRO 2B taught by Professor Egan during the Spring '08 term at UC Irvine.

Page1 / 6

Biological Anthropology Notes 8 - Biological Anthropology...

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