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Why is unwanted recombination a problem in cloning?

Answer and explanation

Correct answer: Insert rearrangement can occur

The direct answer is A: unwanted recombination can rearrange the insert. Recombination means exchange or joining of DNA segments. Some host enzymes may recognise similar sequences and accidentally change the arrangement, orientation, copy number or integrity of cloned DNA. Step by step: the intended insert is placed in the vector; the host copies and maintains the construct; if unwanted recombination occurs, DNA segments may exchange or be deleted; the final clone may no longer match the intended design. This is a problem because the gene may be disrupted, expression may change, or experimental results may become unreliable. Option A is correct because insert rearrangement is a direct consequence. Option B is wrong because a host does not become water. Option C is wrong because recombination does not always increase DNA uptake; uptake and recombination are separate events. Option D is less correct and does not describe the main problem: plate colour may sometimes be used as a screening signal, but unwanted recombination primarily changes DNA structure. Recombination-deficient hosts can improve stability when suitable. Memory cue: unwanted recombination means the clone’s DNA blueprint may be shuffled.

Related tags

Unwanted RecombinationInsert RearrangementStability

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