Now, unlike the XXY and the XO, this is not actually a syndrome because individuals that have this type of caraotype live normal lives and they don't really have too many abnormalities. They have a normal phenotype and they are fully fertile. So suppose that instead of combining sperm cell number four we took sperm cell number three. So we took sperm cell number three and we combined it with a normal X cell as shown in this diagram. What would we form then? Well, we have two identical Y chromosomes, one X chromosome.