NEET · Biology · STD 12 - 6. evolution

Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism ?

A Genetic drift
B Recombination
C Transduction
D Chromosomal aberrations

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Answer & Solution

Correct Answer

(B) Recombination

Step-by-step Solution

Detailed explanation

(b) : The genetic variations exist due to reshuffling of genes caused by recombinations or by mutations. The recombinations are produced by the routine reshuffling of genes during independent assortment of chromosomes, reciprocal crossing of genes during crossing over and random fertilization of gametes.

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 List \(I\) with List \(II\).

List \(I\) (Interacting species)	List \(II\) (Name of interaction)
\(A\). A Leopard and a Lion in a forest/grassland	\(I\). Competition
\(B\). A Cuckoo laying egg in a Crow's nest	\(II\). Brood parasitism
\(C\). Fungi and root of a higher plant in Mycorrhizae	\(III\). Mutualism
\(D\). A cattle egret and a Cattle in a field	\(IV\). Commensalism

Choose the correct answer from the options given below.

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