Now, the problem is, if we take any single DNA molecule and we stretch it out like so, it will actually be quite long. So let's suppose that this is the nucleus of our cell and this is the actual DNA molecule. So notice it's much longer than the size of the nucleus itself. So we can't actually fit the DNA in the way that we have it now into the nucleus of cells. For example, in humans, if we take a human DNA and we stretch it out, it's going to be somewhere between five and 6ft in length, and that's clearly too large to fit it into a tiny, tiny microscopic nucleus of any of our somatic cells. So the way that organisms solve this problem is by creating something called the chromosome.