| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.HL.TZ2.23 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Identify | Question number | 23 | Adapted from | N/A |
Question
The curly hair of the coat of Selkirk Rex cats is due to the presence of the allele SC. These cats can either have tight curls or be moderately curly, whereas the coat of other cats is usually made of straight hair with no curls because of the allele SS. Circles indicate female cats and squares indicate males.
What are the phenotypes of cats with these genotypes?
Markscheme
A
Examiners report
Although this question looked difficult, it was the easiest question on the paper.
