Poliukhov A M
Genetika. 1980;16(7):1294-1300.
The data have been obtained showing that the hand clasping does not constitute a hereditary trait. The frequency of R- and L-types makes nearly 50% in all age groups. Possible relation of this trait with left handedness on non-genetic basis is discussed. The frequency of R- and L-types of arm folding is age dependent. The association of this trait with brain motor asymmetry and asymmetry of finger dermatoglyphics has been established. The correlation calculated by means of the threshold model for multifactorial traits is significant in the pairs of monozygotic twins for T-type, and insignificant for L-type. This may reflect a non-uniform degree of hereditary effects on the function of left and right cerebral hemispheres.
已获得的数据表明，扣手并不构成一种遗传特征。在所有年龄组中，R型和L型的频率接近50%。讨论了该特征与非遗传基础上的左利手之间可能的关系。手臂交叉的R型和L型频率与年龄有关。已确定该特征与脑运动不对称和手指皮肤纹理不对称之间的关联。通过多因素性状阈值模型计算的相关性在同卵双胞胎对中，T型显著，L型不显著。这可能反映了遗传因素对左右脑半球功能影响程度的不一致。
