The approach of using population means
based upon known genes and averaged over minor genes also
allows one to develop the concept of short semi-dwarf,semi-dwarf,
andtallsemi-dwarfclassesusingpopulationstatisticalapproaches.
In this population approach, the genetic class mean and standard
deviation are known. The mean-plus-one standard deviation was
considered a tall, whereas the mean-minus-one standard deviation
was considered a short genotype