Two sister chromatids are held together by the centromere
The Chromosome
The chromosome consists of 2 sister chromatids that are linked together by a structure known as the centromere.
Each of the sister chromatids carries an allele of the same gene.
The link between the two sister chromatids is broken at the anaphase stage of the cell division when spindle fibers pull them apart towards opposite poles within the cell.
More on the chromosome can be found here: https://brainly.com/question/296477
