Question:
Which of the following statement(s) is/are CORRECT in the classical ‘ABC model’ for genetic control of flower development?
Which of the following statement(s) is/are CORRECT in the classical ‘ABC model’ for genetic control of flower development?
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The ABC model explains flower organ identity, where Class A genes specify sepals, Class B genes specify petals and stamens, and Class C genes specify stamens and carpels.
Updated On: Sep 8, 2025
- ‘Class A’ genes solely determine sepal identity
- ‘Class B’ genes solely determine petal identity
- ‘Class C’ genes solely determine stamen identity
- ‘Class C’ genes solely determine carpel identity
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The Correct Option is A, B, C
Solution and Explanation
Step 1: Understanding the ABC model of flower development.
The ABC model describes how three classes of genes (A, B, and C) control flower organ identity during development. These genes work in overlapping combinations to specify the identity of each floral organ.
Step 2: Analyzing the options.
- (A) Correct: ‘Class A’ genes are responsible for the development of sepals. Sepals form the outermost part of the flower, and their identity is regulated by Class A genes such as APETALA1 (AP1).
- (B) Correct: ‘Class B’ genes are responsible for the development of petals and stamens. Petals, which are the second layer of the flower, are regulated by Class B genes like APETALA3 (AP3) and PISTILLATA (PI).
- (C) Correct: ‘Class C’ genes are responsible for the development of stamens and carpels. Class C genes such as AGAMOUS (AG) are critical for the formation of the male and female reproductive organs.
- (D) Incorrect: Class C genes do not solely determine carpel identity. Although Class C genes contribute to carpel development, the carpel is also influenced by the interaction of Class A and Class B genes.
Final Answer: \[ \boxed{\text{(A), (B), and (C) are correct.}} \]
The ABC model describes how three classes of genes (A, B, and C) control flower organ identity during development. These genes work in overlapping combinations to specify the identity of each floral organ.
Step 2: Analyzing the options.
- (A) Correct: ‘Class A’ genes are responsible for the development of sepals. Sepals form the outermost part of the flower, and their identity is regulated by Class A genes such as APETALA1 (AP1).
- (B) Correct: ‘Class B’ genes are responsible for the development of petals and stamens. Petals, which are the second layer of the flower, are regulated by Class B genes like APETALA3 (AP3) and PISTILLATA (PI).
- (C) Correct: ‘Class C’ genes are responsible for the development of stamens and carpels. Class C genes such as AGAMOUS (AG) are critical for the formation of the male and female reproductive organs.
- (D) Incorrect: Class C genes do not solely determine carpel identity. Although Class C genes contribute to carpel development, the carpel is also influenced by the interaction of Class A and Class B genes.
Final Answer: \[ \boxed{\text{(A), (B), and (C) are correct.}} \]
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