Discussion
Which one of the following is an example of Incomplete Dominance ?
Answer: A
The example is flower color in Mirabilis jalapa.
In the four o'clock plant, a cross between red-flowered (RR) and white-flowered (rr) plants gives pink F1 plants (Rr), a blend of the two parents. In the F2 the colours appear in the ratio 1 red : 2 pink : 1 white, so phenotype and genotype ratios coincide. That intermediate heterozygote is the mark of incomplete dominance.
Seed shape in pea shows complete dominance of round over wrinkled. Blood group AB shows codominance, where both alleles are fully expressed, not blended. Coat colour in rabbit is the standard example of multiple alleles.
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