Final answer:
mRNA, tRNA, and tRNA synthetase are gene products. Promoter, allele, and nucleic acid are not gene products but have other roles in gene regulation and DNA structure.
Step-by-step explanation:
Gene products are the final outcomes of gene expression. They are molecules that are produced from DNA and RNA and have a functional role in the cell. In the given options, mRNA, tRNA, and tRNA synthetase are all gene products. mRNA is a copy of a gene that carries the genetic information from DNA to the ribosome for protein synthesis, while tRNA is involved in bringing amino acids to the ribosome during translation.
tRNA synthetase is an enzyme that attaches the correct amino acid to the corresponding tRNA. The other options mentioned, such as promoter, allele, and nucleic acid, are not gene products but are important components of gene regulation and DNA structure.