Analyse the events during every stage of cell cycle and notice how the following two parameters change.

1. Number of chromosomes per cell.

2. Amount of DNA content (C) per cell.

1.  The number of chromosomes (N) -
It  remains constant throughout the different stages in mitosis It remains 2N throughout the cycle.
However, in meiosis the number of chromosome is reduced to half that is from diploid (2N) to haploid (N). The chromosome number is reduced to half during the anaphase I stage this half number is carried on till the end of meiosis.

2. Amount of DNA (C) -
It becomes double during the interphase stage which is followed by mitosis. This doubling occurs due to the replication of the DNA in the S phase.