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Why is a foreign gene selected in genetic engineering?

Answer and explanation

Correct answer: Because it carries information for a desired trait

Direct answer: Option A is correct. In genetic engineering, a foreign gene means a gene introduced from another organism or source into the organism being modified. It is selected because its DNA sequence carries instructions for a desired product or characteristic, such as production of a useful protein, resistance to a condition, or another planned trait. The reasoning is: first identify the required trait; then find a gene associated with that trait; then introduce and express it in a suitable host, if the technique is successful. Option A states the real purpose of choosing the foreign gene. Option B is wrong because a gene is not selected because it is always colorless; colour is not the general criterion. Option C is wrong because genes do not all make water, and water production is not the aim of genetic engineering. Option D is wrong because stopping sound is unrelated to the genetic information being selected. The exact result depends on the gene, host and regulation, so “desired trait” is the correct general answer, not a claim that success is automatic. Memory cue: choose the gene for the feature you want.

Related tags

Foreign GeneDesired TraitGene Selection

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