Now, when the overlapping takes place, then we can exchange in the process known as crossing over. And this dark green piece that came from this here goes onto the light green piece onto this chromatid right over here. And likewise, this lighter green section of the chromosome that came from this homologous chromosome goes on to this. At the end, we formed the following pair of homologous chromosomes in which this is no longer identical to this, and this is no longer identical to this. And at this point, we call these recombinant chromatids. Why?