Questions: The "one gene-one polypeptide" theory states that the synthesis of each gene is catalyzed by one specific enzyme. the synthesis of each enzyme is catalyzed by one specific gene. the function of an individual gene is to dictate the production of a specific polypeptide. the function of each polypeptide is to regulate the synthesis of each corresponding gene.

The answer is the third one: the function of an individual gene is to dictate the production of a specific polypeptide.

Explanation for each option:

1. The synthesis of each gene is catalyzed by one specific enzyme.
   This statement is incorrect. Genes are sequences of DNA that are transcribed into RNA, and this process is not catalyzed by enzymes in the way this statement suggests. Instead, enzymes like RNA polymerase are involved in the transcription process, but they do not "catalyze" the synthesis of genes themselves.

2. The synthesis of each enzyme is catalyzed by one specific gene.
   This statement is misleading. While genes encode the information to produce enzymes (which are proteins), the term "catalyzed" is not appropriate here. Genes provide the instructions for synthesizing proteins, including enzymes, but they do not catalyze the process.

3. The function of an individual gene is to dictate the production of a specific polypeptide.
   This statement is correct. The "one gene-one polypeptide" theory, an extension of the "one gene-one enzyme" hypothesis, posits that each gene contains the information necessary to produce a specific polypeptide, which may function as a protein or part of a protein complex.

4. The function of each polypeptide is to regulate the synthesis of each corresponding gene.
   This statement is incorrect. While some polypeptides (proteins) can regulate gene expression, the primary function of a polypeptide is not to regulate the synthesis of its corresponding gene. Instead, polypeptides typically perform structural, enzymatic, or regulatory roles within the cell.

In summary, the correct interpretation of the "one gene-one polypeptide" theory is that each gene is responsible for the production of a specific polypeptide.