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Question

According to theory put forth to explain the mechanism of organic evolution, when structure of a gene under goes a change, the trait it represents also changes. This results in a heritable variation in population, and may lead to the formation of new species from pre existing species.
Change in gene structure is termed as

A
Mutation
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B
Variation
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C
Genetic drift
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D
Gene knock out
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Solution

The correct option is A Mutation
This theory was stated by Hugo de Vries and is called the theory of mutation. The change in the gene structure is termed as mutation.
Variation is changes in the alleles of genes in a gene pool.
Genetic drift is the change in the frequency of a gene variant (allele) in a population due to random sampling of organisms.
Gene knockout is a genetic technique in which on of an organism's genes is made inoperative.
Thus, the correct answer is option (A).

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