SEGREGATION ANALYSIS OF SOME ANTHROPOSCOP IC TRAITS .1. BINARY TRAITSWITH AGE-INDEPENDENT PENETRANCE

Genetic analysis of a number of anthroposcopic traits was attempted us ing a sample of pedigrees from the Kirgiz population. We used methods of binary trait segregation analysis, which allowed us to analyze pedi grees of arbitrary structure. The genetic model applied was based on t he monogenic diallelic mode of inheritance with arbitrary genotype pen etrances and allowed for different phenotypic expressions of a genotyp e in males and females. The hypothesis of monogenic diallelic inherita nce could not be rejected for the following 12 traits: ability to roll the tongue, earlobe, auricular tubercle, nose shape, base of the nose , accreted eyebrows, fold of the upper eyelid, margin of the auricle, vertex hair whorl, cheekbones, cheek dimples, and height of the nose b ridge. Sex dimorphism was demonstrated for the latter five traits. Pro blems of the relationship between sample informativeness and precision of parameter estimation are discussed.