A person who has an extra copy of a chromosome is said to have?

A person who has an extra copy of a chromosome is said to have trisomy. Trisomy is a condition in which an individual has three copies of a particular chromosome instead of the normal two copies. This can occur when there is an error in cell division during meiosis, resulting in an abnormal gamete (egg or sperm) that carries an extra chromosome. Trisomy can cause a variety of genetic disorders, depending on which chromosome is affected. Some common examples of trisomy disorders include Down syndrome (trisomy 21), Edwards syndrome (trisomy 18), and Patau syndrome (trisomy 13). These disorders are associated with a range of physical and mental health problems, including intellectual disabilities, developmental delays, and birth defects.