At the initial stage of interphase i.e G1 phase(growth 1 phase) only the cellular organells get duplicated but the cell after entering the S(synthesis phase) phase of interphase the DNA Present in form of chromosomes in cell get duplicated.
DNA is condensed with the help of Histone protein and gets converted into Cromatin (later on Chromosomes).
Genes are the segments of DNA. And hence found in DNA.