【摘要】 <正> 人类手掌上除有轴兰叉t之外,还有掌指三叉a、b、c、d。掌指三叉常发生缺失现象,尤以c、d三叉缺失最多见。早有人指出掌指三叉缺失在某种程度上受遗传控制,但其遗传方式各家意见不一,国内未见研究报告。本文调查了520个家庭178更多还原

【Abstract】 Palm prints of 468 Han nationality families, including 936 parents and 847 children, were studied with special reference to the inheritance of missng C triradius. It was suggested that the segregation data were more consjsten with the effect or polygenic rathan monogenic inheritance in the causation of this trait Analysis of the data by Falconer’s method demonstratedthat the heritabiljty of the missing c triradius was calculated to be 98.7±14.19% , indicating the possibility of multiiactorial origin with very strong genetic determination in the genesis of this trait.更多还原