Take a look at solved problem SI and the codon table found in Chapter 13 (Table 13.1). Assuming that a mutation involving a single-base change is more likely than a double-base change, propose how the Asn-141, lie-141, and Thr-141 codons arose. In your answer, describe which of the six possible serine codons is/are likely to be the primordial serine codon of the globin gene family and how that codon changed to produce the Asn-141, He 141, and Thr-141 codons.