Cells spend very little of their life performing mitosis. Most of a cell's life cycle is spent in interphase. Interphase is made up of the first growth phase, the synthesis phase, and the second growth phase. The synthesis phase is characterized by

See the answer below

Explanation:

The synthesis phase of the interphase of the cell cycle is characterized by the replication of DNA in the nucleus and the duplication of the centrosome in the cytoplasm.

At the synthesis phase, the amount of DNA present in the nucleus of a cell is doubled without the doubling of the chromosome number. For example, if a cell enters the synthesis phase with 2 g DNA, it leaves the phase with 4 g DNA while the number of chromosomes remains intact. Also, a duplicate copy of the centrosome is made in the cytoplasm of the cell in preparation for mitosis.