内蒙古3个群体拇指类型的调查

人的拇指间关节活动度往往存在个体差异,一部分人有过伸现象,一部分人则没有。根据人拇指指间关节伸运动的活动度,可把拇指分为直型与过伸型。拇指的这种性状主要受遗传因素控制。已有文献指出,直型为显性性状,过伸型为隐性性状。对美国宾夕法尼亚州的敦刻尔人调查发...     

内蒙古7个群体优势眼的调查

1987～1991年间4次调查了内蒙古7个群体3 247例优势眼的分布特征。研究结果显示：（1）7个群体中右优势眼出现率约为70%～80%。呼和浩特回族、阿拉善蒙古族右优势眼出现率明显低于其他5个群体;（2）右优势眼出现率无性别间差异;（3）优势眼与惯用手这两个性状间存在一定的联系。 Abstract：　A survey on distribution of eye preference of 3247 cases among seven groups in Inner Mongolia were carried out from 1987 to 1991. The results showed that：（1）The right-eye preference showed a frequency of 70%～80% in seven groups. The Hui ethinc group of Huhhot city and Mongols of Alashan League had a obviously lower frequency of this trait than the other five groups.（2）The frequency of this trait showed no sexual signi-ficant difference.（3）There were cor-relations between the eye preference and handedness.