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A new model for measuring breeding genetic distance

A model is proposed for measuring the genetic ‘distance’ between two populations having gene frequencies p and p*. The measure of distance is based on a hypothetical selection process as follows: From population Pasubpopulation P* can be selected having gene frequency p*. Let P 0 be the largest subpopulation yielding gene frequency p*, then the relative size of P 0 to P ‐denoted by θ0(pp*)‐is a measure of the ‘closeness’ of populations having gene frequencies p and p*, and 1 ‐ θ0(p, p*) would be a reasonable measure of genetic distance. We show that the calculation of θ0(p, p*) is a special case of the linear programming problem and derive algebraic expressions for θ0(p, p*) in the two‐allele case. We discuss some of the implications of the use of this measure of distance and compare it to others which have been proposed. We use linear programming methods to calculate genetic distance for three alleles.