Abstract
Population genetics theory has continually expanded the range of biological phe
nomena incorporated in its models. First random mating, then natural selection,
genetic drift, and more recently linkage have been intensively investigated. Two of
the most active areas of current work concern variable selection coefficients and
effects of geography. Together with work on linkage, on testing of the neutrality
hypothesis, and on the population genetics of ecological phenomena, these areas
account for a large fraction of the effort in contemporary theoretical population
genetics. The reader will find the reviews by Christiansen & Feldman (13a) and
Hedrick (53a) useful sources of further information. The review by Gould & John
ston (4Ia) surveys empirical studies of geographic variation.
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