One gene controls the synthesis of one

peptide
polypeptide
dna molecule

One gene controls the synthesis of one polypeptide.

Explanation:

The concept of one gene-one enzyme was given by Beadle and Tatum. This concept states that a gene codes only for a single enzyme. The enzyme affects the metabolic pathway of the reaction.

The enzymes are the proteins which performs a metabolic function. The protein is made up of amino acids. The amino acids are joined together to form a  linear chain. This linear chain is also called as a polypeptide.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!