When someone has three chromosomes on chromosome 21, it means you have Down syndrome. I know the genetic mutation in the photo is Down syndrome because when three chromosomes are present, people tend to use the term "trisomy," also known as Down syndrome. Down syndrome is a genetic disease that affects not only the child or person affected by it, but everyone else as well. Down syndrome is a genetic mental and physical disorder that is very hard on some. Down syndrome is a disorder that has some defects, such as those of the face, heart, vision and hearing, and other health-related problems. It is also the most common genetic defect, affecting many children. Down syndrome is caused when chromosomes are divided during meiosis, the cell retains both copies of chromosome no. 21, which means that the person with Down syndrome has an extra copy in every cell of their body. This is a sad genetic disease that can change a person's life. Even though it is a devastating genetic mutation, people with Down syndrome are some of the most loving people of all....