sisarkromosomit

Sisarkromosomit, also known as sister chromatids, are two identical copies of a single chromosome that are formed during DNA replication. They are joined together at a region called the centromere. This attachment occurs before cell division, specifically during the S phase of the cell cycle. The purpose of creating sister chromatids is to ensure that each daughter cell receives a complete and identical set of genetic information. During mitosis and meiosis, these sister chromatids are meticulously separated and segregated into different daughter cells. In mitosis, sister chromatids separate and become individual chromosomes, each going to one of the two daughter cells. In meiosis, sister chromatids also separate, but this happens in meiosis II, after homologous chromosomes have already separated in meiosis I. The precise separation of sister chromatids is crucial for maintaining genetic stability and preventing aneuploidy, a condition where cells have an abnormal number of chromosomes.