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

Find the incorrect statement among the following:

A In sex linked recessive traits the gene is transmitted from unaffected carrier female to some of male progeny.
B Accumulation of phenylpyruvic acid in brain results in mental retardation
C Individuals affected by Down's Syndrome will have congenital heart defect and are more intelligent.
D Turner's Syndrome is caused due to the absence of one X-chromosome.

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Answer & Solution

Correct Answer

(C) Individuals affected by Down's Syndrome will have congenital heart defect and are more intelligent.

Step-by-step Solution

Detailed explanation

(C) Individuals affected by Down's Syndrome will have congenital heart defect and are more intelligent.,
Individuals affected by down's syndrome have short stature and mental retardation.

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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