KROK 1 2008 – Question 156 · KROK (Medicine) · Biology
A boy has I (I⁰I⁰) blood group and his sister has IV (IᴬIᴮ) blood group. What blood groups do their parents have?
- A. II (IᴬI⁰) and III (IᴮI⁰)
- B. I (I⁰I⁰) and III (IᴮI⁰)
- C. II (IᴬIᴬ) and III (IᴮI⁰)
- D. I (I⁰I⁰) and IV (IᴬIᴮ)
- E. III (IᴮI⁰) and IV (IᴬIᴮ)
Hint
Work out which alleles each parent must carry: the sister needs both dominant alleles to be present, and the boy needs a recessive allele from each parent.
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