Article
Transition-transversion bias is not universal: a counter example from grasshopper pseudogenes.
PLoS genetics - 2 Feb 2007
Keller Irene, Bensasson Douda, Nichols Richard A
Abstract excerpt
Comparisons of the DNA sequences of metazoa show an excess of transitional over transversional substitutions. Part of this bias is due to the relatively high rate of mutation of methylated cytosines to thymine. Postmutation processes also introduce a bias, particularly selection for codon-usage bias in coding regions. It is generally assumed, however, that there is a universal bias in favour of transitions over...
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