1. In Japanese four o'clock flowers, color is inherited by genes that show incomplete dominance. In such flowers, a cross between a homozygous red flower and a homozygous white flower will always result in pink flowers.

Incomplete dominance occur when two allele expresses itself in the phenotype of an organism.

Its a situation where by an allele is not dominant over another other in an heterozygous condition but it gives a blend of the two allele in the phenotype of the offspring.

Example is the phenotype of a 4'o clock plant that gives pink flower when a red flower is crossed with white flower.