And then we're going to finish off with the XYY carryotype. So in individuals with Clinfelter syndrome, there is an extra copy of the X chromosome. So instead of having, let's say, the Xx or the XY chromosome, we have the Xx Y chromosome. Now, the reason that this exists is a result of nondisjunction that can take place either in meiosis one or meiosis two, more specifically in anaphase one or anaphase two or of meiosis. So to see exactly what we mean by that, let's take a look at the following diagram that describes nondisjunction taking place in anaphase II of meiosis. So let's suppose we have a normal female individual, and that normal female individual produces Xcel.