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In order for the human diploid number of 46 to be maintained through generations, which of the following must occur?
Chromosomes replicate prior to meiosis but not prior to mitosis.
Replication occurs prior to mitosis to produce gametes and fertilization restores the diploid number.
Sister chromatids form in the G1 phase of the mitotic cell cycle.
Sister chromatids are formed prior to mitosis and meiosis.