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Fill in the numbered blanks below using single words or symbols.
A chromosome has one long DNA molecule. When a chromosome replicates, it forms two ____1_____ ____2_____, each containing a copy of the original DNA molecule, that are held together initially across their lengths by multi-subunit protein complexes called ____3_____. At a later stage, most of the ____3_____ are removed but some remain at the centromere to keep the two ____1_____ ____2_____ together until the _____4_____ stage of mitosis. At this point the remaining ____3____ begin to be removed so that the ____1_____ ____2_____ dissociate to become separate chromosomes. The _____5_____ attached to the _____6_____ at the centromeres of the two chromosomes ensure that the two chromosome copies migrate to opposite poles of the dividing cell (the identical chromosome copies normally ____7_____ equally into the daughter cells).