Mutation Rate - Mutational Spectrum

Mutational Spectrum

The mutation spectrum of an organism is the rate at which different mutations occur at different sites. Typically two sites are considered, each of which may have three mutations, resulting in six total rates for most mutation spectra. The two sites are the two correct pairs possible in DNA: A:T pairs and C:G pairs;

There is a systematic difference in rates for transitions (Alpha) and transversions (Beta).