Final answer:
A cell must maintain the pattern of gene expression that leads to its differentiation in order to preserve its identity.
Step-by-step explanation:
In order to preserve its identity, a cell must maintain the pattern of gene expression that leads to its differentiation.
During differentiation, cells undergo major changes in size, shape, metabolic activity, and function. However, all cells in the body contain the same DNA. The different cell types become different by expressing only the portions of DNA that are relevant to their own function. This unique genetic expression is what allows cells to maintain their identity.
For example, skin cells will express genes specific to skin cells, which determines their characteristics and function as epidermal cells. This process of differentiation is regulated by location-specific chemical signals from the cell's environment.