Multiple choice general knowledge science & technology

If a mother with blood type B, has an offspring with blood type A, what blood type does the father have?

  1. A

  2. O

  3. AB

  4. B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For a child to have blood type A when the mother is blood type B, the father must contribute an A allele. If the father is blood type AB, his genotype is AB, meaning he can pass either an A or B allele to the child. When he passes the A allele and the mother (who could be genotype BO) passes her O allele, the child would have blood type A (genotype AO). This is the only option among the choices that guarantees the father can contribute an A allele.

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