Question

You should always read footnotes, as they often contain valuable information.

Answer 1

Horizontal gene transfer (HGT), also known as lateral gene transfer, refers to the movement of genetic information across normal mating barriers, between more or less distantly related organisms, but can also be known as the acquisition by an organism of genetic information by transfer, for example via the agency of a virus, from an organism that is not its parent and is typically a member of a different species.

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