Q19 - Grafting Reveals Where RMS1 Signalling Originates
The RMS1 gene encodes a signalling protein which is altered in modern crops. Its activity can be studied by grafting together seedlings from different plants, and monitoring their growth.
Using the information and data, determine which of the statements are true or which are false.
A. RMS1 activity increases shoot branching.
B. The signal produced by RMS1 travels towards the shoot tip rather than towards the roots.
C. RMS1 activity in the root is sufficient to give WT plant architecture.
D. RMS1 activity in the root is necessary to give WT plant architecture.
Question reproduced from IBO 2017, Theoretical Exam A, licensed under CC BY-NC-SA 4.0 - attributed to the International Biology Olympiad. Open the full exam PDF · Official answer key & worked solutions