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In wild-type Arabidopsis thaliana, the four types of floral organs (sepal, petal, stamen, carpel) are arranged in concentric whorls from outside to inside. With reference to the ABC model of floral organ patterning, match the homeotic mutants in Group 1 with their respective arrangements of organs in the four whorls given in Group 2.
In wild-type Arabidopsis thaliana, the four types of floral organs (sepal, petal, stamen, carpel) are arranged in concentric whorls from outside to inside. With reference to the ABC model of floral organ patterning, match the homeotic mutants in Group 1 with their respective arrangements of organs in the four whorls given in Group 2.
| Group 1 | Group 2 |
|---|---|
| (P) A class mutants | (i) sepal, sepal, carpel, carpel |
| (Q) B class mutants | (ii) sepal, petal, petal, sepal |
| (R) C class mutants | (iii) carpel, stamen, stamen, carpel |
| (iv) sepal, sepal, petal, petal |
(A) P−iv, Q−ii, R−i
(B) P−iii, Q−i, R−ii
(C) P−ii, Q−i, R−iii
(D) P−iii, Q−i, R−iv
Answer
Answer: (A) P−iv, Q−ii, R−i
Explanation:
In the ABC model, A class mutants lead to sepal and petal loss, resulting in sepals replacing petals (iv). B class mutants cause petals to replace stamens (ii), and C class mutants cause carpel to replace stamen (i).
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