Abstract

Evidence suggests that the finger-tip pattern size, as measured by the total ridge-count, is an autosomal trait which is independently influenced by the sex-chromosome complement, normal or abnormal. In males, the presence of each X-chromosome diminishes the total number of ridges in the patterns nearly three times as much as does the presence of each Y-chromosome. In females, the reduction of ridges, as the X-chromosome complement increases, is less regular. These phenomena are discussed in relation to embryonic oedema or dehydration as possible consequences of aneuploidy.

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