Available options: -Williams syndrome; -Turner syndrome; -cri-du-chat syndrome; -down syndrome;
Q: Answer the following question given this paragraph: One common example of an extra-chromosome disorder is Down syndrome ( Figure below ). Children with Down syndrome are mentally disabled and also have physical deformities. Down syndrome occurs when a baby receives an extra chromosome 21 from one of his or her parents. Usually, a child will receive one chromosome 21 from the mother and one chromosome 21 from the father. In an individual with Down syndrome, however, there are three copies of chromosome 21 ( Figure below ). Therefore, Down syndrome is also known as Trisomy 21. These people have 47 total chromosomes. Q: What's the most common disorder from having an extra chromosome? A:
A:
down syndrome