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In the anaphase II stage of meiosis, the sister chromatids are separated and begin moving to opposite poles of the cell, according to About.com. When the paired sister chromatids are fully separate, then each is considered to be a full chromosome. These are known as daughter chromosomes. Continue Reading.
During the S phase the cell replicates the chromosomes by taking one chromatid and effectively doubling it (these are later ripped apart during Anaphase in Mitosis). So during the S phase of the Interphase cycle, chromosomes are replicated into two sister chromatids. Normally after this phase there is a check off to make sure nothing went wrong with the replication however should there be any mutations that will create some new DNA form this is where it would be made.