Bio 416 evolution
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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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Bio 416 evolution

BIO 416Evolution

Lecture #21

Kin

Selection &

Altruism

March 6, 2009

Dr. Karen Schmeichel  Oglethorpe University


Business

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

Objectives:

  • Explore choosiness: What’s the

    benefit?

  • What happens when females

    are competitive?

  • Discuss altruism (a difficulty for

    Darwin) and indirect fitness


Bio 416 evolution

A Simple Assumption

One sex:

“competitive”

Other sex:

“choosy”


Bio 416 evolution

Gray Tree Frog Serenade

http://www.mister-toad.com/photos/frog/hyla_versicolor_05.html


Bio 416 evolution

What’s the Attraction?

What do these advertisements tell the “choosy” mate?

  • Fitness/Gene Indicator

  • Food Acquisition

  • Sensory Biases

  • Sexy-son Hypothesis


Bio 416 evolution

Direct Caloric

Benefits


Bio 416 evolution

When the Females

Experience Sexual Selection:

(i.e.,females are competitive)

Polyandry


Bio 416 evolution

Anglerfish:

An extreme

case of

Sexual

Dimorphism


Bio 416 evolution

Other

Evolved

Behaviors

Kin Selection

& Social

Interactions


Bio 416 evolution

Altruism: the fly in Darwin’s ointment?


Bio 416 evolution

Hamilton’s

Coefficient

of Relatedness

“r”:

The probability that

Homologous

alleles in

two individuals

are identical

by descent


Bio 416 evolution

Computing “r” with pedigrees

The “Got from”/ “Give to” Approach


Bio 416 evolution

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


Bio 416 evolution

Kin Selection:

Natural selection favoring the

spread of alleles that increase

the indirect fitness


Bio 416 evolution

  • For 3/9:

  • Ch 12: 447-478

  • Kin Selection II

  • & Lit review #3


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