Evolution of the Human Blood Group Factors

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Abstract
In an attempt to account for the distribution of the blood group factors in white peoples and the differences in distribution among other races, the present knowledge concerning the blood group factors in apes and monkeys reviewed. Based on these results, the view favored by the author that there originally were 2 or more races, some belonging predominately to our one group or type, to a different group or tyoe, and that by crossing the present distribution of the blood group factors resulted. The theory that the present frequences were built up by repeated mutations appears to be refuted by the data at hand. Other factors affecting the blood group distribution are migration, isolation and inbreeding, as well as crossing.