75
min
1.25
hours
12.5
%
75
min
1.25
hours
12.5
%
The Mitosis Duration Calculator computes the total time spent in mitosis from the durations of its four phases and calculates the mitotic index from cell counts. Mitosis is the process of cell division that produces two genetically identical daughter cells. Understanding mitotic timing is essential in cell biology, cancer research, and developmental biology.
The mitotic index, which represents the fraction of cells actively dividing, is widely used in pathology to assess tissue growth rates and tumor aggressiveness.
The calculator performs two computations:
The four phases of mitosis proceed sequentially: prophase (chromosome condensation), metaphase (alignment at the cell plate), anaphase (sister chromatid separation), and telophase (nuclear envelope reformation). Each phase duration varies by organism and cell type.
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A typical animal cell spends about 75 minutes in mitosis with a mitotic index of 12.5%, indicating moderate proliferation.
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Tumor cells divide faster (38 min mitosis) and have a high mitotic index (40%), a hallmark of aggressive cancers.
The mitotic index is the percentage of cells in a population that are undergoing mitosis at a given time. It is calculated by dividing the number of cells in mitosis by the total number of cells and multiplying by 100. A high mitotic index indicates rapid cell division and is used as a prognostic indicator in oncology.
Prophase is typically the longest phase of mitosis, often accounting for 40-50% of the total mitotic time. During prophase, chromosomes condense, the mitotic spindle forms, and the nuclear envelope begins to break down. The exact timing varies by organism and cell type.
Pathologists count mitotic figures in tissue sections to determine tumor grade. A high mitotic index suggests rapid cell proliferation and is associated with more aggressive tumors and poorer prognosis. It is one of several criteria used in grading systems for breast cancer, sarcomas, and other malignancies.
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