Principles of Evolution, Ecology and Behavior (EEB 122)
Neutral evolution occurs when genes do not experience natural selection because they have no effect on reproductive success. Neutrality arises when mutations in an organism's genotype cause no change in its phenotype, or when changes in the genotype bring about changes in the phenotype that do not affect reproductive success. Because neutral genes do not change in any particular direction over time and simply "drift," thanks in part to the randomness of meiosis, they can be used as a sort of molecular clock to determine common ancestors or places in the phylogenetic tree of life.
00:00 - Chapter 1. Introduction
04:56 - Chapter 2. Genes and Amino Acid Changes Not Reflected in Phenotypes
14:29 - Chapter 3. Neutral Evolution in the History of Life
20:38 - Chapter 4. Mechanisms of Neutral or Random Evolution
35:28 - Chapter 5. The Molecular Clock of Neutral Evolution
Complete course materials are available at the Open Yale Courses website: http://open.yale.edu/courses
This course was recorded in Spring 2009.
Tagged under: meiotic drivers,neutral evolution,maladaptation,amino acids,phenotype,genotype,mutation,allele fixation,pseudogenes,junk DNA,common ancestry,canalization,trait accumulation
Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.
Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip
Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans
1. Students enter a simple code
2. You play the video
3. The students comment
4. You review and reflect
* Whiteboard required for teacher-paced activities
With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.
Carry out a quickfire formative assessment to see what the whole class is thinking
Create interactive presentations to spark creativity in class
Student teams can create and share collaborative presentations from linked devices
Turn any public video into a live chat with questions and quizzes