092007_EvolutionaryMechanisms3

092007_EvolutionaryMechanisms3 - Intro to Organismal...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
9/20/2007 1 Intro to Organismal Biology 9/20/07 Announcements 2 1. Biology Department Survey Go to“External Links” on Blackboard Today’s class Evolutionary mechanisms continued: 1. Genetic drift (chance effects due to small pop. size) 2. Gene flow (migration) 3. Mutation (generating new variation) 4. Nonrandom mating 5. Natural selection (Relevant reading: Ch. 23, 51 pp.1129-1130) 3 Gene flow 4 Evolutionary Mechanisms Gene flow Population may gain or lose alleles Results from movement of fertile individuals (e.g., migration) or gametes (e.g., long- distance pollination) 5 Evolutionary mechanisms Mutation The only way to generate NEW alleles Mutation rates lower in plants & animals compared to bacteria and viruses. Only mutations in germ cells are passed to offspring. 6
Image of page 1

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

View Full Document Right Arrow Icon
9/20/2007 2 Evolutionary mechanisms: Mutation 1. Example: Point mutation e.g., AAATCGCCCG copied as: AAATCGCCC C Consequences? Could be harmless: 1.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern