{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Handout 7 - B ILD 3 Fall 2008 Section Mon 9-9:50 AM HANDOUT...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
BILD 3 – Fall 2008 Section: Mon 9-9:50 AM HANDOUT 7 I. Terms/phrases to know Lecture 19 (11-10-08) o Eusocial o Nepotism o Reciprocal altruism Lecture 20 (11-12-08) o Prisoner’s dilemma game o Tit-for-tat strategy o Quadrupedal Lecture 21 (11-14-08) o Pygmy o Mitochondrial DNA o Indigenous II. Important concepts Coefficients of relationship (r) o Diploid/diploid mating Example: humans, termites, naked mole rats, etc. Page 1
Image of page 1

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

View Full Document Right Arrow Icon
BILD 3 – Fall 2008 Section: Mon 9-9:50 AM o Haploid/diploid mating Example: hymenoptera (bees) Only diploid queen reproduces by mating with a haploid male Because diploid females have a high coefficient of relatedness (r=3/4) to each other, they would want to work for the colony and help raise a sister as the new queen that can have offsprings of her own If females were to mate with a haploid male, their r value with their female offsprings would only be ½ so there is a selective pressure to be sterile and to leave the reproducing to the queen Altruistic behavior o What is driving force of altruistic behavior in… Haploid/diploid population: __________________________________________ Page 2
Image of page 2
BILD 3 – Fall 2008 Section: Mon 9-9:50 AM Diploid/diploid population: __________________________________________ o Is it heritable? If it involves death, altruistic behavior is only heritable if the inclusive fitness, which is Darwinian fitness of individual + (relative’s fitness x r), is high so that there is a good chance of the alleles of altruistic behavior will be passed on However, if cost of behavior is zero and it benefits relatives, there will be selective pressure to increase the frequency of alleles involved with it o Belding ground squirrels Individuals will give alarm calls when they see predators approaching Females usually give alarm calls while most males do not Why? o Different dispersal pattern as females and males mature! Females tend to stay close to own colonies so they are surrounded by relatives (hence, more inclined to give alarm calls to warn her kin of predators) Males typically migrate to other colonies so they are not related to members of those groups (therefore, less likely to give alarm calls) These squirrels demonstrate that the cost of altruistic behavior has driven the evolution of sex-limited behavioral differences in alarm-call giving o 2 mechanisms that can lead to altruistic behavior Kin selection (discussed above and in handout 6) Reciprocal altruism – process by which Darwinian fitness of members of a group can be increased if benefits of altruistic behavior go in both directions (benefits of altruistic behavior can extend beyond one’s immediate relatives to unrelated individuals of the same species or even to different species) Page 3
Image of page 3

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

View Full Document Right Arrow Icon
BILD 3 – Fall 2008 Section: Mon 9-9:50 AM
Image of page 4
Image of page 5
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