... betweenheterozygosity and growth rate variables in western forest trees. In : CONCLE M.T. (ed.),Proc. Symp. Isozymes North American Forest Trees and Forest Insects, USDA, GeneralTechnical ... with a neutral theory for the origin and maintenance of enzyme polymorphisms. The variation at these enzymatic loci should be maintained, atleast in part, by a heterozygous ... & LIVSHITS (1983), in human populations, and LEDING et al.(1983), in pitch pine, are inclined to attribute the correlation to inbreeding. LEARY et al.(1984)...