In a population of cells, 50 are in prophase, 75 are in prometaphase, 75 are in

Question

In a population of cells, 50 are in prophase, 75 are in prometaphase, 75 are in metaphase, 50 are in anaphase, 50 are in telophase, and 700 are interphase. Of those in interphase, 250 have 2X amount of DNA and 200 are have somewhere in between 1X and 2X. G2 lasts 6 hours. Calculate the mitotic index and fraction (percent) of the cell cycle spent in each phase. Answer your questions with numbers only, eg 10(not 10 percent, or ten). _______ mitotic index ___________ percent in G1 ______ percent in S ______ percent in G2 How many minutes are spent in each of the following phases of mitosis? Again answer only with numbers (eg 10). ________ prophase _________ prometaphase ________ G1 ___________S _________M

Explanation / Answer

Mitotic index = P + M+A + T/ TOTAL CELLS

50+75+75+50+50 / 50+75+75+50+50+700

300 / 1000= 0.3

mtotic index is a measure for the proliferation status of a cell population. It is defined as the ratio between the number of cells in mitosis and the total number of cells.

S phase- 40 %

G1 phase 30%

G2 phase- 20%

M phase- 10 %

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