In case this is one of those trick questions, (i.e. onecell divides 100 times), the answer is obviously 101.
Otherwise, the answer is not nearly as simple. 100 generations would in principle give you roughly 1030 cells.
However, a "typical" cell has something between 100 and 1000 femtoliters of volume, of which 90% is water. Consequently, 1030 cells would need something like 1016 to 1017 liters of water, which is about the equivalent of Lake Michigan. A cell body of that size is rather unlikely to be encountered. Nutrition and oxygenation of such a living mass is by no means trivial (or even realistic).
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After 100 divisions, there would be 2^100 (approximately 1.27 x 10^30) cells. This is calculated by doubling the number of cells at each division cycle.
If one cell divides six times, it will produce 64 cells in total. This is because each division results in a doubling of the number of cells, so 2^6 = 64.
The cell divides twice during meiosis, resulting in four daughter cells with half the number of chromosomes as the parent cell.
2,4,6...
After the cell has divided four times, there will be 16 cells. After the cell has divided eight times, there will be 256 cells.
Mitosis results in two daughter cells that are genetically identical to the parent cell. The original parent cell divides into two identical cells during mitosis.