| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.HL.TZ1.13 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 13 | Adapted from | N/A |
Question
In humans the ABO blood groups are an example of inheritance involving multiple alleles. In a family the parents have blood group A and blood group B respectively. Their first child has blood group O. What is the probability that their next child will have blood group B?
A. 100 %
B. 75 %
C. 50 %
D. 25 %
Markscheme
D
Examiners report
N/A
Syllabus sections
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