Discussion
Correctly match the following Arabidopsis genes (Group I) and the biological processes they primarily regulate (Group II).
| Group I | Group II |
|---|---|
| (P) CLAVATA3 | (1) Organ identity in flower |
| (Q) CONSTANS | (2) Cell-type specification in root meristem |
| (R) SCARECROW | (3) Meristem size in shoot |
| (S) AGAMOUS | (4) Photoperiodic floral transition |
Answer: C
The correct match is P-3; Q-4; R-2; S-1.
- CLAVATA3 encodes a small peptide that limits WUSCHEL expression and so keeps the shoot meristem at a constant size; clv3 mutants have enlarged meristems.
- CONSTANS responds to day length and activates FT, controlling the photoperiodic transition to flowering.
- SCARECROW directs the asymmetric division that separates endodermis and cortex, a cell-type specification in the root meristem.
- AGAMOUS is the floral C-class gene that specifies stamen and carpel organ identity.
Every other option swaps at least two of these well-defined roles, for instance giving SCARECROW floral organ identity or AGAMOUS root patterning.
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