Dictionary of Human Evolution and Biology

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P,Q,R,...

  Letters designating genotype frequencies in a polymorphism; P is often the frequency of the homozygote of the most common allele, Q of the first heterozygote, etc.

Cf. p,q,r.

  Letters designating allele frequencies in a polymorphism; p is often the frequency of the most common allele, q of the second most common, etc.

Cf. P,Q,R.