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SELECTION DIFFERENTIALS AND SELECTION COEFFICIENTS
Roger Milkman 1
1 Department of Zoology, The University of Iowa, Iowa City,
Iowa 52242
Proof is offered that s 
ig for all forms
of selection where fitness is a nondecreasing function of a normally distributed
phenotype (called fitness potential); s is selection coefficient,
i is standard selection differential, and g is standard differential
effect of a locus genotype.
Evidence is presented that the cost of selection does not limit genic polymorphism; that truncation selection is not necessary for high cost-efficiency; and that opposing directions of selection in a heterogeneous environment do not reduce cost-efficiency critically.
Submitted on May 10, 1977Revised on October 8, 1977
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