​The figure below shows the genes (a, b, c, d, f, l, m n) that are expressed in cell types 1, 2 and 3 because of the concentration of morphogen signaling received by these cells.​

Which one of the following statements is correct about the pattern of gene expression induced by the morphogen?

The transcription factor activated by the morphogen has:

Correct option is B

EXPLANATION-

The figure shows a classic morphogen gradient, where different genes are expressed in different cell types based on morphogen concentration thresholds:
Cell type 1 (high morphogen levels): expresses genes a, b, c
Cell type 2 (medium morphogen levels): expresses genes d, b, f
Cell type 3 (low morphogen levels): expresses genes l, m, n

Gene f is expressed in cell type 2 and 3, meaning it requires lower morphogen levels (i.e., higher affinity).
Gene c is expressed only in cell type 1, requiring high morphogen levels (i.e., lower affinity).

The transcription factor must have higher affinity for the regulatory region of f (activated at lower morphogen concentration) than that of c.

So, the correct option is (b)