nucleotide substitution model
in nucleotide substitution models following terms are used; invariable sites (+I), rate of variation across sites (+G), gamma distribution, rate heterogeneity any one knw definition of these terms ? plz ur help will be highly appreciated.
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I could be wrong but rate heterogeneity is typically for variation in mutation rate across genome. The mutation rate itself is a distribution as it varies (usually modelled as a gamma distribution).