Date of Award   Degree Type   Degree Name  Doctor of Philosophy
(PhD)     Professor Margo Wilson   Professor Martin Daly   Two
lines of reasoning predict that highly social species will have
mechanisms to influence behaviour towards individuals depending
on their degree of relatedness. First, inclusive fitness theory
(Hamilton, 1964) leads to the prediction that organisms will
preferentially help closely-related kin over more distantly-
related individuals. Second, evaluation of the relative costs
and potential benefits of inbreeding suggests that the degree of
kinship should also be considered when choosing a mate. In order
to behaviourally discriminate between individuals with different
levels of relatedness, organisms must be able to discriminate
cues of kinship. Facial resemblance is one such potential cue in
humans. Computer-graphic manipulation of face images has made it
possible to experimentally test hypotheses about human kin
recognition by facial phenotype matching. I show that humans
respond to faci