1. In the "DNA clock", some nucleotide changes cause amino acid substitutions in the encoded protein (nonsynonymous changes), and others do not (synonymous changes). In a comparison of rodent and human genes, rodents were found to accumulate synonymous changes 2.0 times faster than humans and nonsynonymous substitutions 1.3 times as fast. What factors could explain this difference? How do such data complicate the use of molecular clocks in absolute dating?
2. Imagine that Pangea were re-formed today. What might be some of the environmental effects, and how might these changes influence life on Earth?
1. Rodents are thought to have a "faster" molecular clocks because they have a higher metabolic rate, as well as a shorter generation time. With a faster metabolic rate, increased oxygen radicals (free radicals) are produced, and these are known to have mutagenic effects. In addition, the higher rates of DNA synthesis as well as nucleotide replacement in those animals with higher metabolic rates can help explain why the rate ...