Answer:
<h2>
O, A, and B.</h2>
Explanation:
For someone to be type O, that person must have 2 recessive traits for blood type. Let's denote this using the lowercase letter "i," thus making someone with blood type O "ii."
Next the mother is type A. The mother can either be homozygous for the dominant blood type A allele or heterozygous for the trait. This means either of the two following genotypes: AA, or Ai. However, if her child is type O, that means that the mother must have at least one recessive allele, meaning her genotype is "Ai."
Now, let's go to the father. Let's find out his genotype. Start with blood type O. Yes, this works, because the father can donate a recessive allele for blood type to his child. Next, blood type A, which as stated above can be represented by the genotype "Ai" or "AA." Can Ai work? Yes! So we know that an individual of blood type A can be the father. Same goes for blood type B, as someone with that blood type can be heterozygous for it... IE Bi. Next, blood type AB. This DOES NOT work. Why? Because there is no recessive allele for the father to donate to the child. Therefore, the only blood types that the father can have are O, A, and B.
Conclusion:
Hope you found this helpful. It certainly helped me review :)
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