Yes , it’s possible if person with type A blood has a genotype IAj0
IAj0 and IAIB
So if we draw Punnett square we get such offspring
F 1: IAIA , IAIB , IAj0 , IBj0
So we have probability 25% to get child with type blood B( IBj0 )
But of person with type A blood has genotype IAIA , their child can not have type B blood , because of:
IAIA and IAIB
Offspring has genotypes IAIA or IAIB
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