Most eukaryotes have two copies of each chromosome in their nuclei and their chromosome complement is said to be DIPLOID OR 2n. Eukaryotes with one copy of each chromosome and their chromosome complement is said to be HAPLOID OR n. The number of chromosome sets is called the PLOIDY of a cell or species.
Replication of DNA of each individual chromosomes creates two new identical molecules called SISTER CHROMATIDS. Newly formed sister chromatids are held together at a region called the CENTROMERE. Each daughter nucleus receives exactly the same number and types of chromosomes and contains the same genetic info as parental cells. The equal distribution of daughter chromosomes to each of the two cells that result from cell division is called CHROMSOME SEGREGATION.
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