Re: Hamilton's rule
- From: an588@xxxxxxxxxxxxxxxxxxx (Catherine Woodgold)
- Date: Sat, 12 Nov 2005 12:29:46 -0500 (EST)
Guy Hoelzer (hoelzer@xxxxxxx) writes:
> My confusion is rearing its ugly head again. If the axes of the graph are
> "frequency in focal individual (Y axis) vs frequency in population (X
> axis)", then I don't see how dominance/recessiveness can influence the lines
> at all. What am I missing?
One of the lines is labelled "donor". The only individuals
who act out the "donor" phenotype are the ones which have
the set of genes that code for altruism. If altruism is
a recessive trait, then all of the "donors" must have
two copies of the altruism gene. Therefore the frequency
in the "donor" focal individual is always 1 if altruism
is a recessive trait.
But if the altruism gene
is dominant, then the set of "donors" includes some
individuals with one copy of the gene and some individuals
with two copies of the gene. If an individual is
observed to carry out an altruistic act, or if it
finds itself experiencing an overwhelming urge to
carry out an altruistic act, then an observer
(or the organism itself) can conclude that the
individual has one or two copies of the altruism gene.
The expected frequency in this individual can thus be
predicted to lie between 0.5 and 1 (closer to 1 if
the altruism gene is very common in the population).
--
Cathy Woodgold
http://www.ncf.ca/~an588/par_home.html
We are all Iraqis now.
.
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