Q.Differentiate incomplete dominance with co-dominance.
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Start your 14-day free trial to unlock the full solution →Incomplete dominance produces a blended, intermediate F1 phenotype; co-dominance produces an F1 that expresses both parental traits fully and separately.
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Both incomplete dominance and co-dominance are exceptions to Mendel's simple law of dominance, in which a heterozygote does not show only the dominant parental phenotype, but they differ in how the two alleles' effects combine in the heterozygote:
Incomplete dominance: neither allele is completely dominant over the other, and the heterozygote's phenotype is an intermediate blend of the two parental phenotypes -- a new phenotype distinct from either parent. The classic example is flower colour in the four o'clock plant (Mirabilis jalapa) or snapdragon: crossing a red-flowered plant with a white-flowered plant gives an F1 generation of pink-flowered plants, an intermediate that resembles neither red nor white parent.
Co-dominance: both alleles are fully and independently expressed in the heterozygote, so that both parental phenotypes appear together, side by side, without blending into any intermediate form. The classic examples are the human AB blood group, where both the A and B antigens are separately and fully expressed on red blood cells (rather than blending into some intermediate antigen), and roan coat colour in cattle, where red hairs and white hairs are both present together in the coat (rather than merging into a uniform pink colour).
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