Study Of Hereditary Mode On Six Anthropological Traits

As the important index in the study of human population genetics, tongue moving types and behavioral traits of lateral functional dominance are correlative with genomic factors. Most of heredity modes of them, however, have not revealed. In order to resolve this problem, 72 families involving 1065 individuals in Chifeng and Huhhot areas, 1040 Han students and their sibs and parents, and 41 pairs of twins in Huhhot were investigated during 2001 to 2002. The investigated index included 6 anthropological traits, i.e. rolling tongue, pointed tongue, twisting tongue, handedness, clasping hand and folding leg.Heredity modes of 6 traits were studied by analysis of population genetics, by the method of family combination analysis, by the methods of proband's sib analysis, segregation analysis, the threshold model of polygenes, and analysis of typical family trees, according to the data of the 72 families. The relative importance between genetic and environmental effect on each character was evaluated by comparing the coherence of twins. Gene frequencies of 5 genetic characters, calculated from Han group in Huhhot, were compared with other groups by u-test so as to study the population or nationality difference in heredity.The results showed as follows: (1) 6 traits are correlative with genomic factors according to analysis of population genetics and comparison of the coherence of twins. (2 ) The hereditary mode of rolling tongue or pointed tongue was the dominant heredity of single gene of autosome, and the can-rolling type or can-pointed type was the dominant character. Twisting tongue was the recessive heredity of single gene of autosome, and the non-twisting type was the dominant character. (3 ) There was gene interaction between twisting tongue and rolling tongue or pointed tongue. The expressionof the gene of twisting tongue (tt) was dependent on the gene's existence of rolling tongue (R) or pointed tongue (P) . (4) The hereditary mode of handedness or folding leg was likely the dominant heredity of single gene of autosome, and the right type of them was the dominant character. (5) Clasping hand was likely controlled by polygenes with several genes, in which a dominant gene played a major role, and others were modificatory ones. (6) More or less, environmental factors affected the phenotypes of the 6 characters, and there was less environmental influence on the traits of tongue moving types and clasping hand than handedness and folding leg.In this paper, the hereditary modes of 6 traits were discussed synthetically with multi-methods, in which pointed tongue, clasping hand and folding leg were reported for the first time.