Incomplete dominance
is
the
situation
where
the
heterozygote
exhibits
a
phenotype
that
is
intermediate
between
the
two
homozygous
forms. For example, flower colour i the snapdragon, Antirrhinum majus, is determined by a single pair of alleles, one promoting red petals, the other, white petals. Since there is no dominance relationship between the two allels, the represented by upper case letters - R to represent the red allele, W to represent the whita allele. The monohybrid cross is then represented by the following: