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

Example for autosomal hyper aneuploidy is

A Down's syndrome
B Klinefelter's syndrome
C Turner's syndrome
D Haemophilia

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Answer & Solution

Correct Answer

(A) Down's syndrome

Step-by-step Solution

Detailed explanation

(A) Down's syndrome,
A hyper aneuploidy organism is the one having chromosome number higher (i.e., 2n + 1), than a normal individual with one genome. Down's syndrome is a disease in which chromosome number 21 (autosome) is triple in human beings.

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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