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,
and tall semi-dwarf classes using population statistic alapproaches.
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. Thus, there were eight tall and
one short–tall genotypes; seven short semi-dwarf, 37 semi-dwarf,
and seven tall semi-dwarf genotypes (Fig. 1). Some tall semi-dwarf
genotypes were taller than some tall genotypes (Fig. 1). Similarly,
many of the semi-dwarf genotypes were taller than the short–tall
line.