AP BIOLOGY

Detailed explanation-1: -Sister chromatids are physically held together by cohesin, which is a protein complex consisting of four core subunits (Fig.

Detailed explanation-2: -Cohesin forms rings that hold the sister chromatids together, whereas condensin forms rings that coil the chromosomes into highly compact forms.

Detailed explanation-3: -It is a specific kind of repetitive DNA, called “alpha satellite.” The alpha satellite DNA is where the proteins that the centromere needs to attach to the spindle fibers come together.