No life would be possible without mitosis.
Cell theory tells us that all living things are
made of cells and that all cells come from other
cells. How does one cell become two cells? By
dividing. But the cell can’t divide into 2
living cells unless it copies its DNA, then
divides the DNA evenly into the two halves that
are about to become two cells. The division of
the DNA into the “daughter cells” is mitosis.
A fertilized egg cell can only turn into the
trillions of cells in a human by doing an awful
lot of cell division. Even after we finish
growing, we need cell division to replace the
cells that we constantly lose from our skin,
digestive tract, and other places. We also need
new cells to repair tissues, fight disease, and
make reproductive cells.
The main reason we age is that our cells don’t
divide as much as they did when we were young,
so aging gives you an idea about what happens
when there is less mitosis.
Some types of cells in our bodies do very little
mitosis after we’re born. Can you figure out
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