Question

what do you mean by gene?

Answer 1

gene is the functional unit of DNA ,with a specific biological function.
one gene is responsible for the synthesis of one protein.

Answer 2

Gene is the basic physical unit of heredity.
 It is a linear sequence of nucleotides along a segment of DNA that provides the coded instructions for synthesis of RNA, which, when translated into protein, leads to the expression of hereditary character.

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