When studying cell division in tissue samples, scientists often calculate a mitotic index, which is the ratio of dividing cells to the total number of cells in the sample. Scientists often calculate the mitotic index to compare the growth rates of different types of tissue. Which type of tissue would have a higher mitotic index, normal tissue or cancerous tissue? Explain.

A cancerous tissue would have a higher mitotic index. The cancer cells reproduce at a rapid rate due to the lack of contact inhibition. The contact inhibition stops normal cells from going through mitosis after 20-50 times, but since nothing is regulating that for cancer cells, there is going to be more cells dividing compared to the total number of cells.

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