At the beginning of cell division, each chromosome consists of two identical sister chromatids that are joined together at the centromere. Each sister chromatid is a duplicated copy of the chromosome and contains the same genetic information. These chromatids are formed during the S phase of the cell cycle, when DNA replication occurs. The entire structure, consisting of the two sister chromatids and the centromere, is what is observed when chromosomes become visible during processes like mitosis or meiosis.
When chromosomes become visible at the beginning of cell division, what does each chromosome consist of?
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