noun
- a chromosomal condition in which there are three copies of a particular chromosome instead of the normal two
Usage: medical
Examples
- Down syndrome is caused by trisomy 21, where there is an extra copy of chromosome 21.
- The genetic counselor explained that trisomy can occur with any chromosome.
- Prenatal testing can detect certain types of trisomy during pregnancy.
- Trisomy 18 is a serious chromosomal disorder that affects multiple organ systems.
- The doctor ordered additional tests to rule out trisomy after the initial screening.
- Most cases of trisomy occur randomly during cell division.