title: Selection at a multiallelic locus: Feller's transformation.
abstract: An explanation of Feller's result enabling the contours of mean viability at a triallelic locus to be rendered circular is offered, and a proof given which does not involve the direct use of homogeneous coordinates. In a subsequent paper we propose to use the fact that the same transformation also maps the contours of equal average effect for each gene into circles to establish further results.
mesh_terms: D000483:Alleles; D005787:Gene Frequency; D008433:Mathematics