BIOC54H3 Lecture 9: Lecture 9

81 views5 pages

whiteguinea-pig53

11 Apr 2011

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Lecture 9: social behaviour of female lions, territory defence: territory defence can be quite vicious, they defend feeding territories, against other prides of lions. And they need large areas in order to feed the offsprings in their pride: they had models of lions, and produced playbacks of roars. Lions are good at estimating of how many roars there are at the same, so they can estimated the number of individuals coming in as a threat. there is a variation in defence behaviour. there are leaders: they approach playback first and more rapidly. Laggards: lag enough for the leaders to get attacked, and the laggards avoid being attacked. I t was always the leader that was injured : leading is a risky behaviour. where does lagging come from: altruism : groups of related individuals. But we don"t see typical relationship we see with altruism. I t is not the case that anyone is defecting.

Related Questions

Explain the unusual sex-determining system of eusocial insects like ants and bees. Why does this system favor the evolution of a non-reproductive worker caste? Why are workers all female? Why do workers sacrifice their own reproductive success to help the queen?

Explain why a queen bee produces equal numbers of sons and daughters, but workers favor a 3:1 ratio of daughters to sons among the queenâs offspring.

Under what conditions can behavior for reciprocal altruism (individuals helping each other) evolve between non-relatives? What does such a system depend upon?

tealcamel490

True or False? Mate choice is important onanimal species behavior. Male and female animals often differ inthe cost of reproduction and therefore have different behaviors

True or False? Natural selection is the sum ofsurvival and fertility mechanisms that affect reproductivesuccess.

Question!

Water fleas, Daphnia magna, can switch betweenasexual and sexual reproduction cycles. Which of the followingobservations support the hypothesis that sex is favored inunpredictable environments?

Select one:

a. The introduction of predators triggers sexualreproduction.

b. D. magna reproduces asexually every other generationin a variety of habitats.

c. D. magna reproduces sexually when its aquatichabitat dries up.

d. Asexual D. magna strains outcompete introducedcompetitors.

e. A and C

Question

Reciprocal altruism can be best explained with a model proposedby Trivers in 1971: If one individual (A) pays some cost to helpanother individual (B), but the cost is recovered at some point inthe future (when B helps A), then natural selection might favorbehaviors that lead to this type of reciprocity. In which of thefollowing situations is reciprocal altruism likely to occur?

Select one:

a. in dynamic large populations where individuals rarelyinteract with the same set of partners

b. in eusocial groups such as termites, ants, and other suchspecies

c. in large populations of marine invertebrates

d. in stable groups, with ongoing interactions with the same setof partners

Fill in blanks and answer q

Leaf cutter ants exhibit eusociality or true social behavior.Worker ants, which are females, cut and transport the leaves andrear the fungus on the leaves as well as rear the young produced bythe queen. The ants exhibit haploidiploidy so all of the males havea ________ number of chromosomes in their body cells. The daughtersfrom a single male receive all of the same paternal genes so thedaughters are related by _______% (coefficient or relatedness=r)from this source alone. Daughters get Â½ of their genes from theirmother. Therefore, the workers (daughters) are related by_______%(r) through their mother and the total relatedness (r) ofthe workers from a single male and queen is _________%.

In another ant species, the relatedness (r) of the workers is0.65 or 65% since the queen has matings with multiple males. UsingHamiltonâs Rule (rB>C), explain if this type of altruisticbehavior makes sense for the inclusive fitness of these worker antsif B equals 8 and C equals 4 for each individual ant. (4 pts.)

brownleopard162

BIOC54H3 Lecture 9: Lecture 9

Document Summary

Get access

Related Documents

BIOC54H3 Study Guide - Midterm Guide: Adaptationism, Pleiotropy, Coevolution

Biology 1001A Lecture Notes - Lecture 16: Robert Trivers, Reciprocal Altruism, Estrous Cycle

Biology 1002B Lecture Notes - Lecture 22: Isight, Eusociality, Haplodiploidy

Related Questions