Interphase

Interphase comprises G1 phase, S phase and G2 phase, including growth and DNA replication.

During G1 phase, growth and preparation precede DNA replication. The ordinary diploid nuclear state is $2n,2C$.

During S phase, nuclear DNA replication produces paired sister chromatids. DNA content rises from $2C$ to $4C$, while the chromosome count remains $2n$.

G2 phase follows completed nuclear DNA replication and precedes mitosis. The ordinary diploid state is $2n,4C$. ^[ref]