Meiosis is the process where gametes are produced. During meiosis, a diploid cell duplicates its DNA and undergoes 2 cell divisions (meiosis I and meiosis II)
A diploid cell has 2 copies of every gene.
Once its DNA is duplicated, there are 4 copies of every gene.
After the cell division at meiosis I, there are two cells with 2 copies of every gene
After the cell division at meiosis II, there are four cells with 1 copy of every gene.