Question

What is the average cell cycle span for a mammalian its DNA, prepares for the process of division, and divides. The duration of the cell cycle varies from cell to cell.

Answer 1

Hint: The cell cycle has four phases in which cell divides are G1, S, G2, and M phase. Here, the M phase is considered as mitosis and meiosis in the cell cycle. G1, S, and G2 are phases of Interphase which is the longest phase of the cell cycle.

Step by step answer:

The cell cycle is a 4 stage process in which the cell increases in size, copies. The average cell cycle span for a mammalian cell is approximately 24 hours.
The cells usually remain in the G1 phase for 10 hours out of the total 24 hours of the cell cycle.
The length of the S phase/Synthetic phase varies with respect to the total DNA that the particular cell contains. The rate of synthesis of DNA is fairly constant between different cells and species. In S phase chromatin fibre also produced but there is no change in the number of chromosomes.
The G0 phase of the cell cycle is also known as the quiescent stage. This is the stage wherein the cell exits the cell cycle to enter a phase of dormancy. Cells in this phase can re-enter the cells cycle processes at any point to replace the degenerating cells
Cells that enter the G0 phase are generally those which have a long life. For example, cardiac cells and osteocytes enter the G0 phase in cases of myocardial infarction and osteoporosis respectively
Colchicine is a chemical that inhibits the process of microtubule polymerization. When colchicine is added to a group of cultured cells, the cells enter mitosis and get arrested with condensed chromosomes

Note: During the interphase stage of cell division, the cell grows (G1 phase) and makes a copy of its DNA (synthetic phase). During the mitotic (M) phase of cell division, the cell separates its DNA into two sets (DNA replication) and divides its cytoplasm (cytokinesis), thus forming two new cells
The cell cycle duration of sperm cells is 74 hours, red blood cell is 7 days, the plant cell is 2 hours, and the yeast cell is 90 minutes.