Dictionary of Human Evolution and Biology

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P1, P2, P3, Etc.

1. Mendelian nomenclature for the first parental generation (P1, the parents), the second parental generation (P2, the grandparents), and so forth.

Cf. F1, F2, F3, etc.

2. notation that makes reference to premolar teeth in which the most anterior tooth is the lowest number and the most posterior tooth is the highest number. The number is either lower case (indicating a mandibular tooth) or upper case (indicating a maxillary tooth). There are two ways this is used: (a) in reference to retention or absence of a tooth from the primitive eutherian mammalian set of teeth, the dental formula of which is: Premolars may have been lost in which case the existing teeth may have premolars designated by a number larger than the number of actual teeth; this is the case among the catarrhines, which have two premolars, P3 and P4, P1 and P2 having been lost through time. (b) in reference to the teeth that are present in an existing species. The anterior most molar would be P1 regardless of the ancestral condition.

Cf. M1, M2, M3, etc.

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