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Beyond Dominant and Recessive alleles Against Mendel’s principle….. Some alleles are neither dominant nor recessive. Many traits are controlled by multiple alleles or multiple genes. Incomplete Dominance Incomplete dominance: neither allele is dominant See p. 319 A red (RR) and white (WW) flower were crossed and produced pink. The pink flower had a genotype of RW Red+ White= Pink + = Codominance Codominance: Both alleles contribute to the phenotype of the organism. Ex. In cattle, red hair allele and white hair alleles are codominant. They look pinkish, brown, but up close they have white hairs and red hairs. Heterozygous chickens appear speckled, but up close they have black and white feathers. Roan Horse Speckled Andalusian Chickens