May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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31Inheritance Genetic CrossesMedium1 mark

Two sets of parents have an equal chance of producing a baby with either blood group AB or blood group B. What are the genotypes of the two sets of parents?

1
$I^{A} I^{A}$ and $I^{B} I^{O}$
2
$I^{A} I^{B}$ and $I^{B} I^{B}$
3
$I^{A} I^{B}$ and $I^{B} I^{O}$
4
$I^{A} I^{O}$ and $I^{B} I^{B}$