Examine Table 4-1. How many hours does the cell cycle last in the root tips of corn and in onion? Which plant has cells that divide more quickly? How many cell cycles could corn and onion roots undergo in 4 weeks (the cell cycles in Table 4-1 are given in hours, not days)? If after a cell divides both daughter cells could divide and then their daughter cells could divide, how many corn cells and how many onion cells would be present at the end of 4 weeks if you started with just one cell of each?

Table 4-1

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TABLE 4-1 Cell Cycle Phase Durations in Root Tip Cells and Cell Cultures