NEET 2013 · Class 12

Principles of Inheritance and Variation

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB' blood group : 'B' blood group in 1 : 2 : 1 ratio. Modern technique of protein electrophoresis reveals presence of both 'A' and 'B' type proteins in 'AB' blood group individuals. This is an example of

  1. (A)partial dominance
  2. (B)complete dominance
  3. (C)codominance
  4. (D)incomplete dominance

The NCERT line that answers it

Verbatim line

But when $I^A$ and $I^B$ are present together they both express their own types of sugars: this is because of co-dominance.

Chapter
Principles of Inheritance and Variation
Section
4.2.2.2 Co-dominance
Page
10
Words matched
12 of 12

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that when IA and IB alleles are present together, both express their own sugars due to co-dominance, which directly matches the MCQ's description of AB blood group individuals having both A and B type proteins.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute checkMore from this chapter

Question text is reproduced from the published NEET 2013 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.