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If a mother is blood type O, her child is blood type O, and the father is blood type A, the father’s genotype most likely has __________. A. an allele for B B. at least one allele for O C. a mutation for O D. two alleles for O

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Answer:

If the mother is blood type O, and the child is also blood type O, it indicates that the child inherited an O allele from both parents. Since the father is blood type A, he must have at least one allele for A. Therefore, the correct option is:

A. an allele for B