[The risk of the occurrence of diabetes based on the data from a genealogical study of the parents].

A study of the Kharkov population revealed the effect of parent exogamy for liability of the progeny to diabetes mellitus that was more pronounced in sons than in daughters. Minimum genetic effect on the formation of diabetes mellitus concerns the group of reduced exogamy. In type I diabetes mellitus, the maximum genetic effect concerns the group of moderate exogamy, in type II diabetes--the group of elevated exogamy.