Codominance differs from incomplete dominance in that codominance:
Aexpresses both parental characters in the offspring
Bblends the two parental characters into one
Cmasks one parental character completely
Dneeds more than two allelic forms of a gene
Answer & Solution
Correct answer: A. expresses both parental characters in the offspring
1. Both are patterns of non-Mendelian inheritance, so neither shows simple masking.
2. In incomplete dominance neither allele dominates and the characters blend into an intermediate form.
3. In codominance the alleles from both parents are dominant, so both are phenotypically expressed.
4. The difference is blending against showing both side by side.
5. Complete masking is complete dominance, and needing more than two allelic forms is multiple allelism.
_Source: NECTA CSEE 2022 Biology 033, Question 1: Multiple Choice Items, item (iv)_
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