What is a gene A. A series of DNA molecules.
B. A segment of protein.
C. A series of amino acids.
D. A segment of DNA molecule.

D. A segment of DNA molecule

Explanation:

Gene is a segment of a DNA molecule that holds instruction needed for the synthesis of useful products (protein). Ideally, DNA is the storage material of genetic information in a cell. The DNA harbors the GENE, which itself is being expressed in order to use the information contained in it to produce useful products responsible for the phenotype of an organism.

A gene contains sequences made up of nucleotide bases that determines the sequence of amino acids to be produced, and ultimately the type of protein.

A segment of DNA molecule

Explanation:

the correct answer is:

a population changes in response to a change in the environment.

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