Chromosome structure and numbers review (article) | Khan Academy
https://www.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-chromosome-structure-and-numbers/a/hs-chromosome-structure-and-numbers-review
Web ResultThe sister chromatids are identical to one another and are attached at a compressed region called the centromere. This is important for chromosomal separation during cell division. When the sister chromatids are connected at the centromere, they are still considered to be one chromosome (X-shaped).
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