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The presence-absence polymorphism and the size of P-1(1) were studied in the Polish population of the badger Meles meles (Linnaeus, 1758) (n = 79). P1 is more often absent than P1. The lengths of P-1(1) range from 0.97 mm to 2.63 mm (V = 16.3-22.3). A breach in the continuous variation of the size of the teeth between their absence and the minimum length of the crown that is 0.97 mm suggests that a threshold mechanism, related to size, operates at an early stage of P-1(1) ontogeny. Such a mechanism would allow the development of a tooth only if it had reached the threshold size at the critical stage of its ontogeny. The correlation between the presence or absence of P-1(1) and the number of roots of P-2(2) confirms the existence of a gradient in shape and size within the morphogenetic field of cheek teeth. The frequent occurrence of P-1(1) in the Polish population of the badger (73%) corresponds to the clinal variation of the presence-absence polymorphism of the first premolars in Eurasia.

Quasi-continuous variation of teh first premolars in the Polish population of the badger Meles meles