So in an individual, in a male individual that has trisomy 21, they have an extra additional copy of chromosome 21. So we have not two, but three of these individual chromosome 21. And so that's why this condition is known as trisomy 21. So this is the carotype that describes the carreotype of A. So this should be male individual who has down syndrome. Notice that she has or he has an extra copy of chromosome 21.