Co-dominance vs Incomplete Dominance — NEET Biology
✅ Asked in NEET 2026Match List I with List II — A. Incomplete dominance, B. Co-dominance, C. Pleiotropy, D. Polygenic inheritance with I. Human skin colour, II. Antirrhinum sp., III. Phenylketonuria, IV. ABO blood groups.
Match List I with List II — A. Incomplete dominance, B. Co-dominance, C. Pleiotropy, D. Polygenic inheritance with I. Human skin colour, II. Antirrhinum sp., III. Phenylketonuria, IV. ABO blood groups.
Answer & NCERT explanation
Correct answer: A — A-II, B-IV, C-III, D-I
Incomplete dominance is seen in flower colour of Antirrhinum (snapdragon); ABO blood groups show co-dominance; phenylketonuria is a pleiotropic single-gene disorder; human skin colour is a polygenic trait.
Read more NCERT concept on the PYQ
Explain the following terms with example (a) Co-dominance (b) Incomplete dominance
Co-dominance occurs when both alleles are equally expressed in the heterozygote (e.g., AB blood type shows both A and B antigens), while incomplete dominance produces an intermediate phenotype (e.g., red × white flowers = pink). Students often confuse these by thinking incomplete dominance means both traits show equally—it actually means a *blend* or intermediate expression. The key distinction: co-dominance = both traits visible separately; incomplete dominance = new intermediate trait. NTA tests this by giving flower colors, blood groups, or cattle coat colors and asking students to identify which pattern is shown. Remember that co-dominance doesn't create a new phenotype, but incomplete dominance does.
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