Which of the following is least likely to be a source of new whole genes in a genome? A. Gene duplication B. Horizontal gene transmission C. Point mutations D. Transposable element insertion

C. Point mutations

Explanation:

Point mutation involves the insertion or deletion of a base pair or the substitution of a single base for another in a gene. Point mutation rarely cause a significant change in a gene.

Gene duplication involves the repetition of a gene-containing DNA region in an organism. It can result from errors in DNA replication/repair and other circumstances in the cell.

Horizontal gene transmission involves the transmission of gene-carrying DNA materials between different genomes of different species of organisms.

Transposable elements are regions of DNA that have the ability to move from one place to another within the same genome. They often create a kind of mutation and change the genetic identities of cells.

The correct option is C.

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