In article <D7DDBp.Jq1 at zoo.toronto.edu>,
Mark Siddall <mes at zoo.toronto.edu> wrote:
>>I often wish Zuckerlandl and Pauling never wrote that paper.
>There is no clock. Independent lineages (post cladogenesis) are just that
No, I doubt they are _that_ independent. Do you mean to claim that the
biology of (say) two sibling species of sparrow are sufficiently
different (their mutational repair systems, for example) that they evolve
at _totally_ independent rates? That in the triple (song sparrow,
chipping sparrow, oak tree) that the first two are not more similar in
rate of molecular evolution? I suspect that clocks are useful, if not
perfect, any time you get down near the species level.
Joe Felsenstein joe at genetics.washington.edu (IP No. 188.8.131.52)
Dept. of Genetics, Univ. of Washington, Box 357360, Seattle, WA 98195-7360