the present invention relates to a method of identifying tree lineage capable of expressing desired biological and / or biochemical phenotypes and method of producing such trees . it also relates to a method of identifying a genetic marker associated with a genetic locus conferring at least one enhanced property . also it relates to a stand of clonal enhanced property trees produced by the method of the present invention , the genome of the trees containing the same genetic marker associated with the enhanced property relative to a value characteristic of the average of the genus . it relates also to a method of producing a family of trees wherein at least about half exhibit at least of enhanced property . the present invention also relates to a genetic map of qtls of trees associated with enhanced properties . the present invention further relates to a genetic marker of fiber length of trees .