How might a gene mutation be silent, with no observable effect on a cell or an organism? a. codons are complementary to anticodons in trna. a gene mutation that changes a codon to its anticodon would have no observable effect on the cell or the organism. b. many proteins are superfluous to the function of a cell. a gene mutation in a gene that encodes an unnecessary protein would have no observable effect on the cell or the organism. c. several codons are stop codons. a gene mutation that inserts a stop codon when only a few amino acids remain in the peptide sequence would have no observable effect on the cell or the organism. d. many amino acids are encoded by multiple codons. a gene mutation that encodes the same amino acid would have no observable effect on the cell or the organism.