In deletion, we have that broken off detached chromosome segment, basically moves away and never reattaches onto that particular original chromosome. In the case of duplication, we're dealing with a homologous pair of chromosomes. And so we have chromosome number one, and it's Homologous chromosome number two. So we have a segment of, let's say, the second one break off, and then it moves on to that Homologous chromosome. So we say that's a duplication, because this chromosome already carries those similar types of genes, and that's why we have a duplication taking place. Now in a translocation, we basically have the breaking off of that segment.