(do points) 6. A new altruistic allele arises in a population such that individu

Question

(do points) 6. A new altruistic allele arises in a population such that individuals with the allele give up some personal reproduction in order to help their parents raise offspring. Instead of producing 6 offspring of their own, ind allele produce only 3 offspring. The parents would also normally produce 6 offspring, but is able to produce 10with the help of the altruistic individual. Using Hamilton's rule, determine whether this altruistic allele is likely to increase in frequency in the population. Show your work. ividuals with the 0s) 8 Meaning

Explanation / Answer

Hamilton's rule is a central theorem of inclusive fitness (kin selection) theory and predicts that social behaviour evolves under specific combinations of relatedness, benefit and cost.

Hamilton’s Rule and Altruism

Altruism is favoured by natural selection

rB > C

where r= relatedness (proportion of shared genes)

B= Benefit to the recipient (how many more offspring are produced)

C= cost to the altruist

r = 0.5

Therefore C=3

B=8

0.5 (8) > 3

= 4

Therefore 4 > 3

Hence according to Hamilton's rule, kin selection causes genes to increase in frequency when the genetic relatedness of a recipient to an actor multiplied by the benefit to the recipient is greater than the reproductive cost to the actor.

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