Now we're going to have a slightly different case because crossing over takes place at random. So now in metaphase one, before metaphase one actually takes place during ProPhase one of metaphase one. So actually let's change that to ProPhase because we first want to focus on the process of crossing overtaking place. So crossing over takes place as we know, during prophase I of meiosis. So when crossing over takes place, what basically happens is this piece of DNA here switches exchanges with this piece of DNA. And so what we produce are the following four chromosomes.