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Diploid means two copies of chromosomes in a cell, one from mom and one from dad. Humans have 23 pairs of chromosomes in every cell, from muscle to bone to skin and brain cells. These cells become different even though they have the same DNA because not all of the DNA is expressed.
Each cell contains one half the number of chromosomes as the original parent cell. Meiosis is similar to the cell division process of non-sex cells known as mitosis. Mitosis produces two cells that are genetically identical to and contain the same number of chromosomes as the parent cell. These cells are diploid cells because they contain two sets of chromosomes.