NEET · Biology · STD 12 - 4. principal of inheritance and variation

Identify the wrong statement with reference to the gene \('I'\) that controls \(ABO\) blood groups.

A Allele \('i'\) does not produce any sugar.
B The gene \((I)\) has three alleles.
C A person will have only two of the three alleles.
D When \(I^{A}\) and \(I^{B}\) are present together, they express same type of sugar.

Verified Solution

Answer & Solution

Correct Answer

(D) When \(I^{A}\) and \(I^{B}\) are present together, they express same type of sugar.

Step-by-step Solution

Detailed explanation

When \(I^{ A }\) and \(I ^{ B }\) are present together, they express same type of sugar.

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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