The Evolutions Populations

The Evolutions Populations - The Evolutions Populations...

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

View Full Document Right Arrow Icon
The Evolutions Populations Chapter 23 The Smallest Unit of Evolution - One common misconception about evolution is that individual organisms evolve during their lifetime - Evolutionary processes(e.g. natural selection) acts on individuals, but populations evolve Populations - Population: a localized group of individuals that are capable of interbreeding and producing fertile offspring Concept 23.1: Mutation & sexual recombination produce the genetic variation that makes evolution possible. Mutation - Mutations: changes in nucleotide sequences of DNA -Source of new alleles and genes - Point mutation: change in one nucleotide base in a gene - Chromosomal mutations: delete, disrupt, or rearrange many loci on a chromosome - Gene duplications: duplication of whole segments of a chromosome - Mutation rate averages 1 in every 100,000 genes per generation Sexual Recombination - In sexually reproducing organisms, sexual recombination produces most of the variability in each generation Variation within a Population
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.

This note was uploaded on 03/27/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

Page1 / 2

The Evolutions Populations - The Evolutions Populations...

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