Xyy Syndrome Craft

XYY Syndrome BY JASON CRAFT

XYY syndrome is a type of non-inheritable nonlethal genetic disease that occurs in meiosis II when there is an incorrect separation of chromosomes that only affects the male portion of the population. This disease is quite common with about 1 in 1000 boys having it, that is about 5 to 10 boys being born with it every day in the U.S.. This disease gives a male and extra Y chromosome producing a 47, XXY karyotype. XYY syndrome has very few noticeable features and it is usually diagnosed while looking for other things, in fact this disease was actually found on accident when a man was being tested for a different disease. Some noticeable symptoms of this disease are unusual growth spurts in young children, this usually causes their final height to be about 7 inches above their expected height. This syndrome usually also leads to an increased in the risk of learning difficulties by up to 50%. It can also lead to delayed motor skills, and weak muscle tone.

The picture to the right shows the basics about how this happens. The first 22 pairs are the regular chromosomes while the last two are the x and y chromosomes. As you can see the last chromosome(y)has two instead of one and this is how the disease is caused.