A total of 589 compatible mating couples could be investigated against 432 incompatible mating couples in order to determine the selective mechanism operating on ABO blood groups. There appears to be no striking difference in the proportion of childless couples between the two groups. The mean number of living children presents a significant difference. There is 21% deficiency of 'A' children in the two groups. Similarly, there is 16% deficiency of 'B' children in the two groups. It appears that there is 31.9% fetal wastage in incompatible matings as compared with 17.15% in compatible matings.
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