The Dunkers of Pennsylvania are members of a religious sect, about 50 of whom emigrated from...

The Dunkers of Pennsylvania are members of a religious sect, about 50 of whom emigrated from Germany in the early 1700's. They have remained relatively isolated ever since. The frequency of blood group A in this small group is around 60% while in German and American populations generally, the frequency is 40%. The A^B(I^B) allele is absent in the Dunkers but comprises about 15% of the alleles in both German and American populations. Construct an inference to account for the differences in gene frequencies among the Dunkers as compared to American and German populations.

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