what is one possible reason that mutation 2 leads to the production of normal blood cells rather than sickle- shaped blood cells ? The mRNA codon GAG acts as a stop signal rather than coding for an amino acid. The mRNA codon GAG corresponds to the tRNA molecule that can carry more than one amino acid. The mRNA codon GAG is unreadable and is therefore skipped over during protein synthesis. The mRNA codons GAA and GAG both code for the same amino acid.

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.