* Cell Cycle: The cell cycle is a series of events that lead to cell growth and division. It has four main phases: G1, S, G2, and M (mitosis).

* DNA Replication: DNA is replicated during the S phase of the cell cycle. This means that a cell that has half the amount of DNA compared to others in a mitotically active tissue has not yet replicated its DNA.

* G1 Phase: The G1 phase is the first phase of the cell cycle, and it's the stage where the cell grows and prepares for DNA replication. Since the cell in question has half the amount of DNA, it hasn't yet entered the S phase and is likely still in G1.

In summary: A cell with half the DNA content of other cells in a mitotically active tissue is likely in the G1 phase of the cell cycle, waiting to replicate its DNA before proceeding to the next stages of division.