So now we're going to focus on other types of chromosomal abnormalities that can arise due to different types of conditions. For example, excessive exposure to X ray. So if the cells of our body, for example, are exposed to X ray radiation, then what can happen is a segment of the chromosome can actually break off. And once that segment actually breaks off, it can do one of four different things. We can either have an inversion take place, we can have a deletion, we can have a duplication or translocation. So let's discuss what these actually mean.