| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.HL.TZ0.31 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Deduce | Question number | 31 | Adapted from | N/A |
Question
The pictures show skeletons of a frog (Conraua goliath) and of a domestic rabbit (Oryctolagus cuniculus).
What is the evolutionary relationship between X and Y?
A. They are analogous.
B. X is analogous and Y is homologous.
C. They are homologous.
D. They are neither homologous nor analogous.
Markscheme
C
Examiners report
This question had low discrimination as good candidates were confused by it. Many answered that the structures were analogous, but rabbits jump and frogs swim, so they are homologous. The question was related to the structure of the pentadactyl limb.
