The gene that produces lens crystalline protein has different functions in different cell types. For example, in the eye, the protein forms lenses and in other cells the protein acts as an enzyme. Based on this information, the lens crystalline protein would be considered:

The question is incomplete as it does not have the options which are:

a. multiple alleles

b. incompletely dominant

c. codominant

d. pleiotropic

Option-D

Explanation:

Pleiotropism is the phenomenon in which one gene is responsible for many phenotypes in the organism.

In the given question, since the gene controls two phenotypes at two different sites as the gene form proteins which act as a catalyst where it speeds up the reaction and in the eye it forms the lens.

Therefore the lens crystalline proteins will be considered the pleiotropic in nature.

Thus, Option-D is the correct answer.