| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.HL.TZ2.35 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Determine | Question number | 35 | Adapted from | N/A |
Question
Which are the possible recombinants in a dihybrid test cross involving the linked genes JQ/jq?
A. JQ/jq and JJ/Qq
B. Jq/Qq and Qq/JJ
C. Jq/jq and jQ/jq
D. JQ/jq and Jq/jQ
Markscheme
C
Examiners report
This also contained an error as the linked genes had not been shown using the notation that is specified in AS 10.2.5 and AS 10.2.6. Nevertheless, it was possible for candidates to do some working and convert the information into that form. The question then had one clearly correct answer. Perhaps because of the unfamiliar notation, this proved to be the second most difficult on the exam, but it discriminated relatively well.
