If the product of a functional gene is not a protein, what other product(s) might be encoded by the gene

tRNA and rRNA is the correct answer to this question.

Explanation:

tRNA (transfer RNA) :-

It helps in the assembly process of proteins from amino acids. Transfer ribonucleic acid (tRNA) is a form of RNA molecule that breakdown structure a messenger RNA ( mRNA) codes for a protein.

During translation, tRNAs act at different sites in the cell membrane, a mechanism that composes the mRNA protein molecules.

rRNA (ribosomal RNA) :-

It constitutes most of the cells are called ribosomes, that also take an interest in the expression of proteins.

Ribosomal RNA (rRNA), a cell molecule that forms the core including its protein-synthesizing original recognized as a ribosome, and is transferred to the plasma membrane to help translate information into nutrients in messenger RNA ( mRNA).