Abstract
Computer runs have been done to examine SLATKIN'S
(1975) model for
selection on recombination rates in linear sets of populations with environ-
mental changes affecting two loci. In order to determine whether the suggested
selection pressures on recombination do, in fact, exist, we follow the changes
in frequency at a third locus that is polymorphic for alleles affecting the
recombination rate between the two selected loci. With haploid or diploid
selection models, there can be selection for increased recombination if the
parameter values are chosen suitably, but changes in parameter values often
lead to changes in the direction of selection, so that decreased recombination
is favored, The selection for increased recombination is usually weak, while
that for decreased recombination is frequently much stronger. Weaker selec-
tion on the selected loci often leads to increasing selection for decreased
recombination.
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