03-31_kin_sel - BIOLOGY 325H Behavior and Natural Selection...

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

View Full Document Right Arrow Icon
BIOLOGY 325H Behavior and Natural Selection March 31, 2008 The goal of today's lecture is to synthesize our discussion of animal behavior with the mechanism of evolution. Animal behavior is a collection of species-specific adaptations in how the individual interacts with its environment - in other words, the genes which govern behavior experience natural selection, and selection favors those alleles that maximize survival and reproductive success. This is why we can analyze behaviors in terms of cost- benefit analysis. Natural selection will only favor a behavior whose benefits outweigh its costs (on average), and alleles that produce inherently costly behaviors will decrease in allele frequency over successive generations. But what about behaviors that affect the survival and reproduction of other individuals within the same species? For those behaviors we need to expand our concept of 'fitness', and look at the full consequences of a behavior on the inheritance of the genetic alleles that are ultimately responsible for the behavior. Learning goals 1. Some behaviors have a cost and/or benefit for both individual that performs the behavior and one or more recipients. Based on the profile of cost vs. benefit, what are the four categories of interaction? 2. What is a selfish behavior? Can natural selection favor the evolution and maintenance of selfish behaviors? 3. What is a cooperative behavior? You should be able to explain in terms of costs and/or benefits why the flocking behavior of pigeons is a cooperative means of avoiding predation. 4. What defines a behavior as altruistic? Does an altruistic behavior increase or decrease 'individual fitness'? What is 'inclusive fitness', and what term is used to describe natural selection acting at the level of inclusive fitness? 5. You should learn Hamilton’s Rule, and appreciate that kin selection will only favor those altruistic behaviors for which this rule holds. You need to learn how to calculate the parameter ' r ', degree of relatedness, between offspring and their parents, siblings,
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 04/07/2008 for the course BIO 325H taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

Page1 / 7

03-31_kin_sel - BIOLOGY 325H Behavior and Natural Selection...

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