MHT CET · BIOLOGY · STD 12 - 3. Inheritance and Variation

Formation of AB type of blood group in human is due to __________ inheritance.

A co-dominance
B incomplete dominance
C complete dominance
D pleiotropy

Verified Solution

Answer & Solution

Correct Answer

(A) co-dominance

Step-by-step Solution

Detailed explanation

In blood group AB, the alleles for both antigens, A \(\left( I ^{ A }\right)\) and B\(\left( I ^{ B }\right)\) are expressed equally and independently, giving the genotype \(I ^{ A } I ^{ B }\) (phenotype AB). Thus, the alleles show co-dominance.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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B	Geographical isolation	II	Mule
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