Incomplete Dominance

a. Incomplete dominance :

In incomplete dominance, neither allele of a pair can fully suppress the other, so the heterozygote shows a phenotype intermediate between the two homozygous parents rather than looking exactly like one of them. The chapter's example is flower colour in Mirabilis jalapa (the four-o'clock plant): crossing a red-flowered plant (RR) with a white-flowered plant (rr) produces an F1 generation of pink flowers (Rr) — visibly a blend, not a masking, of red and white. …