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Using trigonometry, Kinghorn (1997) developed the genotype probability index as a measure of the amount of information contained in genotype probabilities predicted by segregation analysis for loci with only three genotypes. Percy (2005) represented the problem algebraically and generalised it for loci with any number of genotypes. This paper describes a general and simpler method for calculating the genotype probability index for loci with multiple ordered or unordered genotypes which requires nothing more than solving a single quadratic equation. |
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