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Lecture 7

PSYC 3100 Lecture Notes - Lecture 7: Fallacy, Chromosome, Ingroups And Outgroups

Course Code
PSYC 3100
Pat Barclay

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Thursday, September 27th, 2018
Evolutionary Psychology
Altruism, Kinship and inclusive Fitness- Lecture 7
Washburn’s Fallacy
Why doesn’t it matter that we share 99% of genes with other people?
o If we share 99% of genes with all other humans, shouldn’t r always
equal 0.99?
o This is from the perspective of all genes trying to propagate
themselves, whereas Hamilton’s rule is from the perspective of any
one gene trying to propagate itself. The gene only cares whether and
individual shares that specific gene- all other genes on the
chromosome are irrelevant to the equation
Gene A is not competitive with gene B or C- if any individual
were identical in every gene but A, from the perspective of
gene A they are not related
Kinship applies all across different forms of life (evidence of kinship in bees, plants
will compete less with their neighbours if they are relatives)
Why Learn to Identify Kin?
Help them (willingness to aid, food sharing, support in violent conflict)
Avoiding harming too much (less harm to kin than non-kin)
o Hamilton’s rule
Avoid mating with them (they carry similar gene, or recessive genes)
We can Predict
There is a psychological mechanism producing behaviour that is effectively
Humans are sensitive to cues of relatedness (not born knowing who our kin
are, have to figure this out)
More tolerant of kin: sharing space, time and resources, can be intrusive (if
they were not related, it would be much harder to co-exist with this tension)
Sentiments to kin depends on reproductive value (expected # of future
offspring that an individual might have) of both self and kin
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