Agene whose expression can be easily visualized and monitored is called a

The expression of a reporter gene can be easily visualized and monitored.

Explanation:

The reporter gene is a type of gene which is attached to a regulatory sequence of an another gene in a cell culture, bacteria, plants or animals. A reporter gene is generally used as an indicator, that is used to determine that a certain gene has been taken up or expressed in a cell or population of an organism.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.