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BIO 416 Evolution

BIO 416 Evolution. Lecture #21 Kin Selection & Altruism March 6, 2009. Dr. Karen Schmeichel  Oglethorpe University. Business:. Essay #2 Adaptation (due) Lit Review #3 Due 3/9 Airtran trip update Exam II 3/13 – Lab exercise too Ch 12: 447-478 Kin Selection. Objectives:.

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BIO 416 Evolution

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  1. BIO 416Evolution Lecture #21 Kin Selection & Altruism March 6, 2009 Dr. Karen Schmeichel  Oglethorpe University

  2. Business: • Essay #2 Adaptation (due) • Lit Review #3 Due 3/9 • Airtran trip update • Exam II 3/13 – Lab exercise too • Ch 12: 447-478 Kin Selection

  3. Objectives: • Explore choosiness: What’s the benefit? • What happens when females are competitive? • Discuss altruism (a difficulty for Darwin) and indirect fitness

  4. A Simple Assumption One sex: “competitive” Other sex: “choosy”

  5. Gray Tree Frog Serenade http://www.mister-toad.com/photos/frog/hyla_versicolor_05.html

  6. What’s the Attraction? What do these advertisements tell the “choosy” mate? • Fitness/Gene Indicator • Food Acquisition • Sensory Biases • Sexy-son Hypothesis

  7. Direct Caloric Benefits

  8. When the Females Experience Sexual Selection: (i.e.,females are competitive) Polyandry

  9. Anglerfish: An extreme case of Sexual Dimorphism

  10. Other Evolved Behaviors Kin Selection & Social Interactions

  11. Altruism: the fly in Darwin’s ointment?

  12. Hamilton’s Coefficient of Relatedness “r”: The probability that Homologous alleles in two individuals are identical by descent

  13. Computing “r” with pedigrees The “Got from”/ “Give to” Approach

  14. Hamilton’s rule: an allele for altruistic behavior will spread if: Br-C>0 more likely if benefits to recipient are great and the cost to the actor is low and the participants are closely related

  15. Kin Selection: Natural selection favoring the spread of alleles that increase the indirect fitness

  16. For 3/9: • Ch 12: 447-478 • Kin Selection II • & Lit review #3

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