Which of the phenomenais responsible for the ability of one gene to code for more than one polypeptide?

The correct option is alternate splicing

Explanation:

In genetics, alternate splicing can be described as a phenomenon through which a single gene can be regulated to produce more than one type of protein. In alternative splicing, certain exons (coding regions of DNA), may be added or removed from the mRNA produced from a gene. This method will make different mRNA's from a single gene. Hence, different proteins will be made from a single type of gene. Alternative splicing is a common phenomenon that occurs in eukaryotes.