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

From the following pedigree chart of a family, one can make an analysis that

A It is an autosomal dominant trait
B It is an autosomal recessive trait
C It is allosomal dominant trait
D It is an allosomal recessive trait

Verified Solution

Answer & Solution

Correct Answer

(B) It is an autosomal recessive trait

Step-by-step Solution

Detailed explanation

(B) It is an autosomal recessive trait,
One can make analysis after observing the pedigree is that it is an autosomal recessive trait.

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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