MICROANATOMY

Detailed explanation-1: -Definition. A chromatid is one of the two identical halves of a chromosome that has been replicated in preparation for cell division. The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere.

Detailed explanation-2: -Anaphase: During anaphase, the centromere splits, allowing the sister chromatids to separate. The kinetochore spindle fibers shorten, allowing for 46 of the newly-freed chromatids to be dragged to one end of the cell and the remaining 46 chromatids to be dragged to the opposite end of the cell.

Detailed explanation-3: -They are called sister chromatids because all the genes and to be specific all the alleles are exactly the same because they are identical copies (Figure 1). Sister Chromatids = Replicated Chromosomes Attached at the Centromere.