everybody doctorow in this video we're gonna cover binary fission so let's start with terminology so binary means to repair fission is splitting apart so this is the process that bacteria most bacteria use to split into to soar one cell becomes two so this would be a analogous to mitosis in our cells now why don't we call it mitosis to me that's kind of the most important thing here we misuse the word mitosis a lot we talk when we talk about mitosis we talk about the division of body cells and that's that's fine but the actual word mitosis means division of the nucleus prokaryotes like these bacteria here don't have a nucleus so we can't so it's basically mitosis but we can't use the term mitosis so I will show you some similarities here as we go on and also show you how cell division of bacteria would be more similar to cell division in plants than in us so first what we're seeing here is DNA replication on the left side of this image that's absolutely true this would be the equivalent of interphase in your cells but not only is DNA replicating the cell is dividing its contents and duplicating its contents so that it can become two cells so we always think of interface as the doubling of your DNA but in this bacteria the cell contents like ribosomes are also having to double or else you'd have two new cells with half as much cell content and that doesn't work so yes the main thing is DNA replication another cool thing about DNA replication with bacteria is all bacteria have one chromosome and it's a circle so we have what's called the origin of replication where cell where DNA replication begins and that actually travels in both directions so you can copy this one circular chromosome in half the time because you're copying it in both directions and it meets on the other side right I think about a clock the orange replication begins at 12 and button goes both directions to 6 rather than having to go all the way back around the clock so alright that's what happens at the beginning so the DNA is being is being replicated being doubled being copied so are the structures inside the cell the cell is also elongating so it's still a single cell but it's getting bigger that way it can pop into two you know relatively normal sized cells all right and then once once that that process has done the cell is now doubled its DNA it's ready to pull its DNA into two piles divvy up its cell components into two piles and then actually split into a cell which you see here with the a septum forming and then you see the actual separation or division of the cell that would be called cytokinesis in bacteria and in our human cells here I grabbed an image of a plant cell dividing to show you some of the comparisons here so obviously the plant cell has multiple chromosomes the bacterial cell only has one but still you get the point the DNA is being pulled into two areas so are the rest of the cell structures in bacteria you have a septum forming it's called a cell plate in plants but it still is their cell wall and then once that new cell walls been built and all the cellular components have been divvied up the cells going to split in two which would be that cytokinesis process alright so that is binary fission how most bacteria divide and go from being one cell to two cell I hope that helps have a wonderful day be blessed