Ch18

Question 1

define Cooperation

Answer 1

Two or more individuals receive a net benefit from their joint actions

Question 2

can natural selection favor cooperation?

Answer 2

yes, but not always since free-riding is more beneficial

Question 3

list the Attributes of Eusociality

Answer 3

(1) Reproductive division of labor
(2) Cooperative rearing
(3) Overlapping generations
* evolved multiple times in animals & Hymenoptera

Question 4

Individuals benefit by exchanging acts of…

Answer 4

Reciprocal altruism, might be favored by ns

Question 5

define Nash equilibrium

Answer 5

applies if neither player benefit by changing strategy

Question 6

define Trait-group

Answer 6

group in which all individuals affect one another’s fitness. Many trait-groups make up a population

Question 7

define Within-group natural selection

Answer 7

acts against cooperators who

pay some cost while others do not

Question 8

define Between-group natural selection

Answer 8

favors cooperation, as groups that cooperate more outproduce other groups