1) Hamilton’s rule is rB>C, and defines the conditions under which a potential a
ID: 11677 • Letter: 1
Question
1) Hamilton’s rule is rB>C, and defines the conditions under which a potential altruist gene may spread by kin selection. Which of the following is the best re-statement of Hamilton’s rule?
a. An altruist variant of a gene will spread in a population if the fitness benefit adjusted by the degree of relation exceeds the direct fitness cost to the donor
b. individuals will have higher fitness if there is not a cost
c. the inclusive fitness of a donor must equal direct fitness for an altruistic variant allele to rise to high frequency in a population
d. a variant of a gene will spread in a population if it directs help toward kin
Explanation / Answer
It is A. r = the genetic relatedness of the recipient to the actor, often defined as the probability that a gene picked randomly from each at the same locus is identical by descent. B = the additional reproductive benefit gained by the recipient of the altruistic act, C = the reproductive cost to the individual of performing the act.
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