Quick Answer: Do chromosomes thicken in mitosis?

What phase do chromosomes become shorter and thicker?

During prophase the nucleoli disappear and the chromatin fibers thicken and shorten to form discrete chromosomes visible with the light microscope. Each replicated chromosome appears as two identical chromatids joined at the centromere.

Does chromosome number change in mitosis?

So during a mitotic cell cycle, the DNA content per chromosome doubles during S phase (each chromosome starts as one chromatid, then becomes a pair of identical sister chromatids during S phase), but the chromosome number stays the same.

Why is prophase the longest phase of mitosis?

the longest phase of mitosis is prophase because in this phase many structure disappear like nucleus membrane and nucleolus at late prophase nd in early phrophase stage centriole become start dividing and shall go to the pole and mid phrophase stage centriole takes position at 90° between each other and lastly at the …

At what stage are chromosomes most easily counted and why?

Answer: Metaphase is a stage during the process of cell division (mitosis or meiosis). Usually, individual chromosomes cannot be observed in the cell nucleus. However, during metaphase of mitosis or meiosis the chromosomes condense and become distinguishable as they align in the center of the dividing cell.

Why are chromosomes short and thick?

As the prophase progresses, chromosomes become shorter and thicker (due to the condensing of their coils). In each chromosome, the chromonema splits lengthwise into two identical threads or chromonemata (dyads). These are coiled round one another. Chromosomes become more distinct.

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