But as expected, the frequencies for each allele are close to what they could have been at the start of human history or with Noah's family.
The shift in frequency (the increase in type O and decrease in type B) can be caused by migration of people groups that had a higher or lower frequency for one of the alleles at the time of migration.
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.
Modern Allele Frequencies Do human populations today reflect these allele frequencies? Table 2 shows the allele frequencies for several populations.