Incomplete Dominance
Situation in which one allele is not completely dominant over another allele
Incomplete dominance is a genetic phenomenon where neither of the two alleles completely dominates the other. Instead, the heterozygote expresses a phenotype that is intermediate between the two homozygous genotypes.
For instance, in the case of flower color, the allele for red flowers (R) and the allele for white flowers (W) are incompletely dominant. A heterozygous individual (RW) would produce pink flowers, which is an intermediate shade between the two homozygous traits.
Incomplete dominance can also be observed in other traits, like height in pea plants, where the heterozygote is intermediate in height compared to the tall and short homozygotes.
It is important to note that incomplete dominance is different from co-dominance. In co-dominance, both alleles are expressed in the heterozygote, producing a distinct phenotype that includes traits from both alleles. In contrast, in incomplete dominance, the heterozygote produces a phenotype that is intermediate between the two homozygous cells.
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