Final answer:
Down syndrome is a genetic disorder characterized by cognitive impairment, physical deformities, and other health issues. It is caused by having three copies of chromosome 21, also known as trisomy 21.
Step-by-step explanation:
A child born with three copies of chromosome 21 who has some intellectual disability, epicranial eye folds, and a shorter stature is said to have a condition known as Down syndrome. Down syndrome is caused by having three copies of chromosome 21, also known as trisomy 21. It is a genetic disorder characterized by cognitive impairment, physical deformities, and other health issues.