O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2010 · Q401 Mark

The inheritance of the ABO blood groups in humans is controlled by three alleles (IA, IB and I°), only two of which can be present in one individual. What are the possible blood groups of children born to a homozygous group A woman and a heterozygous group B man?

Aand B only

Band AB only

CA, B and AB only

DA, B, AB and O

✓ Correct answer

B: and AB only

Oracle Prep sorts past-paper questions by topic, so you can drill Genetics & Variation and see which topics are most likely to come up next.

Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2010 Paper 1 Variant 1, question 40.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content