Question

Correctly match the following Arabidopsis genes (Group I) and the biological processes they primarily regulate (Group II):

• A. P-3, Q-4, R-1, S-2
• B. P-1, Q-3, R-2, S-4
• C. P-3, Q-4, R-2, S-1
• D. P-4, Q-1, R-3, S-2

Hint:

Understanding the roles of key genes in Arabidopsis, such as CLAVATA3 and AGAMOUS, helps us appreciate how genetic networks regulate the development of plant structures. These genes control fundamental processes like meristem size, flower organ identity, and the transition to flowering.

Answer 1

The Correct Option is C

Let's break down the roles of the listed Arabidopsis genes and their biological processes: 
- (P) CLAVATA3: CLAVATA3 is involved in regulating the meristem size in shoot by controlling the balance between stem cell activity and differentiation in the shoot apical meristem. Therefore, the correct match for CLAVATA3 is \( P-3 \).
- (Q) CONSTANS: CONSTANS plays a central role in regulating photoperiodic floral transition, which is the process by which plants transition from vegetative growth to flowering in response to light cues. Therefore, the correct match for CONSTANS is \( Q-4 \).
- (R) SCARECROW: SCARECROW is essential for cell-type specification in the root meristem, particularly in determining the identity of cells in the root. This gene is crucial for the proper patterning of tissues in the root. Therefore, the correct match for SCARECROW is \( R-2 \).
- (S) AGAMOUS: AGAMOUS is a key gene involved in organ identity in flowers, specifically regulating the formation of floral organs. It determines the identity of the stamens and carpels in flowers, so the correct match for AGAMOUS is \( S-1 \).
Thus, the correct answer is (C), with the correct matching being \( P-3 \), \( Q-4 \), \( R-2 \), and \( S-1 \).