EVERYDAY SCIENCE

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.

Detailed explanation-2: -A chromatid is a replicated chromosome having two daughter strands joined by a single centromere (the two strands separate during cell division to become individual chromosomes). From: Human Biochemistry, 2018.

Detailed explanation-3: -Each of the two daughter strands of a duplicated chromosome joined at the centromere during mitosis and meiosis are called sister chromatids.

Detailed explanation-4: -The two copies of a chromosome are called sister chromatids. Sister chromatids are joined together at a region called a centromere.

Detailed explanation-5: -At the onset of mitosis, the nuclear envelope breaks down and chromatin is progressively converted into a discrete set of rod-shaped structures known as metaphase chromosomes (Fig. 1, metaphase).