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- Which blood allele is recessive? A B AB OKaren and Steve each have a sibling with sickle-cell disease.Neither Karen nor Steve nor any of their parents have thedisease, and none of them have been tested to see if they carrythe sickle-cell allele. Based on this incomplete information,calculate the probability that if this couple has a child, thechild will have sickle-cell disease.If the mother is blood type AB , the father is Blood type O . Could the daughter who has type O be their child?