Abstract
The absence of palmar digital triradius d (ADTd), a rare dermatoglyphic trait, was examined in 2,681 Japanese families. The frequency of individuals with this trait was 0.62%, but no sex difference was found. It appears more frequently on the left palm than the right and the bilateral occurrence seems to be more often in familial cases than sporadic ones. It was suggested that the ADRd is transmitted and expressed in a mode of multifactorial inheritance. From the present results and reported cases, the threshold is considered to be shifted by various developmental conditions such as congenital anomalies, familial occurrence and, possibly, twinning.
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Schedule a callMore From: Jinrui idengaku zasshi. The Japanese journal of human genetics
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