And because this is a homologous chromosome, it contains similar genes. We have a duplication take place on this chromosome. So here we have a duplication, because this attaches onto this section right here. And here we have a deletion, because this segment that broke off does not actually return to this particular chromosome. So when duplication takes place, deletion also takes place, as we see in this particular example. So if a segment of DNA breaks off and attaches onto a homologous chromosome, because that homologous chromosome carries those same types of genes, we say that we have a chromosomal duplication take place.