AP BIOLOGY

Detailed explanation-1: -The two “sister” chromatids are joined at a constricted region of the chromosome called the centromere. During cell division, spindle fibers attach to the centromere and pull each of the sister chromatids to opposite sides of the cell. Soon after, the cell divides in two, resulting in daughter cells with identical DNA.

Detailed explanation-2: -Chromosomes and cell division After chromosome condensation, the chromosomes condense to form compact structures (still made up of two chromatids). As a cell prepares to divide, it must make a copy of each of its chromosomes. The two copies of a chromosome are called sister chromatids.

Detailed explanation-3: -The sister chromatids join together in the centromere during the prophase stage of mitosis.

Detailed explanation-4: -Anaphase is the stage of mitosis after the metaphase when replicated chromosomes are split and the daughter chromatids are moved to the cell’s opposite poles. The separation of two chromatids of each chromosome at early anaphase is initiated by the force of repulsion between the divided kinetochores.