â¢ TORNADO (noun). The noun TORNADO has 2 senses: 1. a localized and violently destructive windstorm occurring over land characterized by a funnel-shaped cloud extending toward the ground. 2. a purified and potent form of cocaine that is smoked rather than snorted. Familiarity information: TORNADO used as a noun is rare.
In other words, nothing is different about the way these alleles are inherited; the only difference is in the way the alleles determine phenotype when they are combined. As opposed to partial dominance, codominance occurs when the phenotypes of both parents are simultaneously expressed in the same offspring organism.
In both codominance and incomplete dominance, both alleles for a trait are dominant. In codominance a heterozygous individual expresses both simultaneously without any blending. An example of codominance is the roan cow which has both red hairs and white hairs. In incomplete dominance a heterozygous individual blends the two traits. An example of incomplete dominance is the pink snapdragon, which receives a red allele and white allele. codominance incomplete dominance