Question

PART 1: How Long Do Cells Spend in Each stage of Mitosis? In this activity, you will be presented with cells from the tip of an onion root. You will classify each cell based on what phase it is in. At the end you will count up the cells found in each phase and use those numbers to predict how much time a dividing cell spends in each phase. You can base your calculation on a total cell cycle of 24 hours. You can enter data in this table below: 1. classify each cell as being in one of the phases. -X X -X X X X- x x -X -X X X -X -X X

answer this pls asap

Answer 1

	Interphase	Prophase	Metaphase	Anaphase	Telophase	Total
Number of cells	12	2	1	2	2	19
Percent of cells	12/19 x100 = 63.15	2/19 x 100 = 10.53	1/19 x 100 = 5.26	2/19 x 100 = 10.53	2/19 x 100 = 10.53	100%
Time spent	63.15 % x 1440 = 909.36 min	10.53 % x 1440 = 151.63 min	5.25 % x 1440 = 75.6 min	10.53 % x 1440 = 151.63 min	10.53 % x 1440 = 151.63 min

1. From the above table, it is clear that interphase is the longest stage of cell cycle. In this phase, the cell is in preparatory stage and prepares all the materials required for the upcoming division phase. In order to properly prepare the cell for the mitotic division, cell spents maximum time in Interphase.

2. Onion root tip cells are considered best to study mitosis because the root tip has actively dividing meristematic cells and the size of chromosomes in root tip is larger than the shoot tip and thus can be clearly observed under microscope.

3. In Mammalian system, the Bone marrow cells, the epidermal cells of skin etc are the actively dividing cells.

The cells not undergoing division will be nerve cells.

Thank you