DP Biology (first assessment 2025)
Question 19M.2.SL.TZ2.1g
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.SL.TZ2.1g |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Suggest | Question number | g | Adapted from | N/A |
g.
[Maximum mark: 1]
19M.2.SL.TZ2.1g
(g)
The molecular structures of the mouse alarm compound and fox scent are very similar. Suggest an evolutionary advantage for this chemical similarity.
[1]
Markscheme
the mice would have the same response to another mouse’s danger signal as to the actual presence of the predator/fox
OR
adaptation to fool predator by producing a scent similar to predator’s own scent
OR
allows a group response to a predator/fox/danger when just one mouse detects the danger ✔
Accept any other feasible answer.
Examiners report
In g, better candidates were able to suggest an evolutionary advantage either from the point of view of one mouse being able to bring about a group response, or from the point of view that the fox could not distinguish between mice and other foxes.
