| Date | November 2015 | Marks available | 1 | Reference code | 15N.1.SL.TZ0.15 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 15 | Adapted from | N/A |
Question
In a human with type A blood, what determines the blood group?
A. Sex chromosomes
B. One or two alleles
C. Multiple alleles
D. Codominant alleles
Markscheme
B
Examiners report
Many candidates failed to read that the question was referring only to type A blood. In the guide, in section 4.3.3 it says: State that some genes have more than two alleles (multiple alleles). We can say that multiple alleles refers to more than 2 alleles, therefore answer C is incorrect.
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