Click on the picture to see a larger image. The two pieces are not completely separated at this point. They are held together at a pinched in region called the centromere . Each identical strand is called a sister chromatid . On either side of the centromere region, protein discs called kinetochores provide the place of attachment for kinetochore fibers which are part of the mitotic spindle .
Chromosomes are in the form of chrmatin.
Nucleoli and the nuclear membrane are intact. Mitotic Phase A. Mitosis Mitosis is also called karyokinesis - which means division of the nucleus. It is a continuous process,but it is convenient to divide it into phases for purpose of study. Click on the picture to see a larger image and to compare this stage with the other stages of mitosis. Click on the picture to see a larger image.