[Campbell Biology P.328] How does codominance differ from incomplete dominance? | Practice Question
How does codominance differ from incomplete dominance?
A: In codominance, the heterozygote phenotype is intermediate between the two parental phenotypes; in incomplete dominance, both parental phenotypes are exhibited.
B: In incomplete dominance, the heterozygote phenotype is intermediate; in codominance, both parental phenotypes are exhibited separately.
C: Codominance occurs in plants, while incomplete dominance occurs in animals.
D: There is no difference; they are two terms for the same phenomenon.
Explanation
The text defines incomplete dominance as when the F1 hybrid has a phenotype 'somewhere between' the parents e.g., pink flowers from red and white . It defines codominance as when 'the two alleles each affect the phenotype in separate, distinguishable ways' e.g., both M and N molecules are present in the MN blood group .