KCET · BIOLOGY · STD 12 - 5. Molecular Basis of Inheritance

In genetic fingerprinting, the 'probe' refers to

A a radioactively labelled single stranded DNA molecule
B a radioactively labelled single stranded RNA molecule
C a radioactively labelled double stranded RNA molecule
D a radioactively labelled double stranded DNA molecule

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Answer & Solution

Correct Answer

(A) a radioactively labelled single stranded DNA molecule

Step-by-step Solution

Detailed explanation

(A) a radioactively labelled single stranded DNA molecule,
Leucocytes (white blood cells) are ideal for DNA profiling because they contain a nucleus with DNA. In contrast, erythrocytes (red blood cells) lack a nucleus and, therefore, do not contain DNA. Platelets and serum are not suitable for DNA profiling because platelets do not contain DNA and serum is a fluid component of blood without cellular material.

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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Match Column-I with Column -II. Select the option with correct combination.

Column-I	Column-II
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2. Pioneer species	q. Amount of nutrients in the soil at a given time.
3. Detritivores	r. Species that invade a bare area
4. Standing crop	s. Breakdown detritus into smaller particles

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