The events of metaphase II are similar to those of mitotic metaphase — in both processes, the chromosomes line up along the cell’s equatorial plate, also called the metaphase plate, in preparation for their eventual separation (Figure 5).
Do chromosomes line up during metaphase?
Metaphase: During metaphase, each of the 46 chromosomes line up along the center of the cell at the metaphase plate. Anaphase: During anaphase, the centromere splits, allowing the sister chromatids to separate. … These separated sister chromatids are known from this point forward as daughter chromosomes.
Do chromosomes line up in the middle in metaphase I only?
Chromosomes line up in the middle in metaphase I only. … In metaphase 2, the chromosomes align at the metaphase plate and sister chromatids attach to spindle fibers from opposite poles. In anaphase 2, the centromeres divide and chromatids move to opposite poles.
What happens during the metaphase?
During metaphase, the cell’s chromosomes align themselves in the middle of the cell through a type of cellular “tug of war.” The chromosomes, which have been replicated and remain joined at a central point called the centromere, are called sister chromatids.
What can happen if cells do not duplicate correctly?
The cell cycle controls the four major phases of cell growth and division. … If the cell has not properly copied its chromosomes, an enzyme called cyclin dependent kinase, or CDK, will not activate the cyclin, and the cell cycle will not proceed to the next phase. The cell will undergo cell death.
What structures pull chromosomes apart?
The movement of chromosomes is facilitated by a structure called the mitotic spindle, which consists of microtubules and associated proteins. Spindles extend from centrioles on each of the two sides (or poles) of the cell, attach to the chromosomes and align them, and pull the sister chromatids apart.