| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.SL.TZ2.23 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Calculate | Question number | 23 | Adapted from | N/A |
Question
The Punnett grid shows the inheritance of blood groups.
What is the ratio of phenotypes of the offspring?
A. 1 : 1 ratio of blood groups A : B
B. 1 : 2 : 1 ratio of blood groups A : AB: B
C. 1 : 1 : 1 ratio of blood groups A : AB: B
D. 2 : 1 : 1 ratio of blood groups A : AB : B
Markscheme
D
Examiners report
N/A
Syllabus sections
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