Alvesalo L, Nuutila M, Portin P
Acta Odontol Scand. 1975;33(4):191-7. doi: 10.3109/00016357509027561.
In a Finnish rural population 79.0% of 233 persons had the cusp of Carabelli in first upper molars. Of these 20% showed "positive cusps" and 59% "negative cusps". The occurrence of the structure was bilateral with varying degrees of asymmetry, but if there was no structure on one side of the jaw, the other never showed the cusp. There was no sexual dimorphism either in the occurrence or in the degree of expression of character. Results of the statistical analyses suggested low heritability of the character. However, the dichotomy of having a cusp or not may have genetic basis, but there is large variation in the expression of the "cusp-genotype".
在芬兰的一个农村人口中，233人中有79.0%的人的上颌第一磨牙有卡氏尖。其中，20%表现为“阳性尖”，59%表现为“阴性尖”。该结构的出现是双侧的，不对称程度各异，但如果颌骨一侧没有该结构，另一侧也绝不会出现卡氏尖。在该特征的出现或表达程度上均不存在性别二态性。统计分析结果表明该特征的遗传力较低。然而，有卡氏尖或无卡氏尖的二分法可能有遗传基础，但“卡氏尖基因型”的表达存在很大差异。
