Question

Flowers that develop in Arabidopsis originate from concentric rings of cells. What class of gene(s) is responsible for the development of sepals?

A. A genes
B. C genes
C. B and C genes
D. A and B genes

Answer 1

The correct answer is option A.

Step-by-step explanation:

A flower is a shoot which modifies as reproductive organ. The development of shoot to floral meristem and then differentiation of the meristem to flower is regulated by the gene level by the ABC model, explains the differentiation of the meristem to the various flower parts.

The sepals are the outermost layer that surrounds all other organs of the flower which is regulated by the A gene. The combination with the A gene and B gene controls the formation of petals and combination with the B gene and C gene controls the formation of androecium.

Thus, option-A is the correct answer.

Answer 2

The correct answer will be- option-A

Step-by-step explanation:

A flower is a modified shoot which modifies itself to become a reproductive structure.

The modification of shoot to floral meristem and then differentiation of the meristem to flower is controlled at the gene level. The ABC model represents a model which explains the differentiation of the meristem to the flower parts.

The sepals are the outermost layer which encloses all other parts of the flower and is controlled by the A gene. The A gene in combination with the B gene controls the formation of petals and B gene in combination with the C gene controls the formation of androecium.

Thus, option-A is the correct answer.