Remember there is no inactivation for autosomal genes. C. Incomplete or partial dominance. This is usually called incomplete or partial dominance. In this case, the flower color gene codes for an enzyme that catalyzes pigment production. The red pigment is spread more thinly giving a pink appearance.
Incomplete dominance occurs because the amount of enzyme is limiting in pigment production.
ABO blood type is controlled by one gene with 3 alleles. The two co-dominant alleles code for variant forms of the same enzyme. This gene has 3 different alleles. Any gene can have many alleles because many different variants of the same DNA sequence are possible. Note that dominance relationships depend on structure and function of gene product, not gene itself.