Trisomy 18
Definition
Trisomy 18 is a genetic syndrome of multiple congenital anomalies and severe to profound mental retardation. It is caused by the presence of an extra chromosome 18 in some or all of the cells of the body. Babies with the condition usually do not survive past several months of age. Trisomy 18 in the embryo/fetus is also a common chromosomal cause of pregnancy loss.
Description
Chromosomes are the microscopic structures inside cells that carry the genes. The genetic material inside each cell contains all of the instructions the body needs to develop and function normally. Humans have 23 different pairs of chromosomes. Chromosomes 1-22 are numbered...
[The entire page is 4038 words long]
Join eNotes
Over 3,500 study guides, question and answer forums, literature criticism, reference content, and much more!
