[Netizen]

Eve was formed from Adams rib, so she will have the same genetic markers. Where do all the various blood types come from?

[Westbrook]

From the article at ...
http://www.answersingenesis.org/articles/aid/v4/n1/abo-blood-human-origins

Please read the whole article. It answers your question in technical and statistical detail.

So what light does this shed on human origins? Is it possible for the two people of the Creation account (Adam and Eve) or the eight people on Noah’s Ark to give rise to all of the ABO blood types present in humans today? If Adam and Eve were heterozygous for blood types A and B, respectively (one allele for type O and one allele for either type A or B), they could have produced children that had any of the ABO blood types, as illustrated in Figure 2.

The Punnett square simply predicts what the possible phenotypes would be for a given couple’s children. From the number of children that Adam and Eve likely produced, it is not difficult to envision all of the ABO blood types being passed down to their offspring.

If Adam and Eve were heterozygous for the ABO blood type gene locus, then the allele frequency for the type O allele is 50 percent (2 of 4 alleles), the allele frequency for type A is 25 percent (1 of 4 alleles), and the allele frequency for type B is 25 percent (Figure 2). If there are no selective pressures or genetic drift for these alleles, then the allele frequency will remain constant through all of their descendants. The overall allele frequency in the Punnett square is actually the same for the children as it might have been for Adam and Eve. This scenario would also be true for Noah’s family and their descendants.