27.1 outline

27.1 outline - 27.1 The evolutionary history of a group of...

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: 27.1 The evolutionary history of a group of organisms is called its phylogeny. And usually a phylogenetic tree is used. It shows ancestor-descendant relationships. The tree starts of with a branch, which represents the whole population, then it splits at the node where the species splits off into 2 species, and then the tip represents the species that’s living today or has gone extinct. To figure out the historical relationships between species investigators can either look at how the species looks, which is usually what they end up doing for fossils, or they can look at the genetic code, which is what they use for contemporary populations. WHat is the difference between the phenetic approach and the cladistic approach? It’s looking at DNA vs. looking at physical traits The phenetic approach basically separates species by using a computer program to de- termine how close one species DNA sequence is from another species and then it puts the species in a branch together....
View Full Document

This note was uploaded on 02/12/2012 for the course SCI 2341 taught by Professor Yates during the Spring '11 term at Alabama.

Page1 / 2

27.1 outline - 27.1 The evolutionary history of a group of...

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