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KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation

Identify the wrong statement.

  1. A Alleles b and c also produce sugar.
  2. B Alleles \(I ^{ A }\) and \(I ^{ B }\) produce sugars.
  3. C When \(I ^{ B }\) and b or i are present \(I ^{ B }\) is expressed.
  4. D Both \(I ^{ A }\) and \(I ^{ B }\) are present together and they express because of co-dominance.
Verified Solution

Answer & Solution

Correct Answer

(A) Alleles b and c also produce sugar.

Step-by-step Solution

Detailed explanation

(A) Alleles b and c also produce sugar.,
ABO blood group in humans is controlled by three multiple alleles \(I ^{ A }, I ^{ B }\) and i . There are two types of antigens present in the surface coating of red blood cells - \(A\) and \(B\). The \(I ^{ A }\) and \(I ^{ B }\) alleles produces enzyme glycosyltransferase for synthesis of sugars. Both \(I ^{ A }\) and \(I ^{ B }\) are codominant (i.e., able to express themselves in presence of each other) but are dominant over \(i\).