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Edwards syndrome (trisomy 18) can affect anyone. The condition occurs when a person has an extra copy of chromosome 18, which is random and unpredictable. The likelihood that a parent will have a child with Edwards syndrome (trisomy 18) increases with maternal age at the time of pregnancy.
Chromosome 18 is one of the 23 pairs of chromosomes in humans. People normally have two copies of this chromosome. Chromosome 18 spans about 80 million base pairs (the building material of DNA) and represents about 2.5 percent of the total DNA in cells.
Trisomy 18 is a condition where you have three copies of each chromosome 18 in your body's cells instead of two. This can lead to serious physical and mental disabilities.
Chromosome 18. Description. Humans normally have 46 chromosomes in each cell, divided into 23 pairs. Two copies of chromosome 18, one copy inherited from each parent, form one of the pairs. Chromosome 18 spans about 78 million DNA building blocks (base pairs) and represents approximately 2.5 percent of the total DNA in cells.
Trisomy 18 is a chromosomal abnormality characterized by the presence of an extra copy of genetic material on the 18th chromosome, either in whole (trisomy 18) or in part (such as due to translocations). The additional chromosome usually occurs before conception.
Trisomy 18 is a rare genetic disorder that affects approximately 1 in every 3,315 births in the United States — around 1,187 babies each year. In typical development, a baby gets 23 pairs of...
Trisomy 18, also called Edwards syndrome, is a chromosomal condition associated with abnormalities in many parts of the body. Individuals with trisomy 18 often have slow growth before birth (intrauterine growth retardation) and a low birth weight.
Edwards' syndrome, also known as trisomy 18, is a serious genetic condition caused by an additional copy of chromosome 18 in some or all of the cells in the body.
Chromosome 18 appears to have the lowest gene density of any human chromosome and is one of only three chromosomes for which trisomic individuals survive to term 1. There are also a...
Trisomy 18 is caused by an extra chromosome 18 and is usually associated with intellectual disability, small birth size, and various congenital anomalies, including severe microcephaly, heart defects, prominent occiput, low-set malformed ears, and a characteristic pinched facial appearance.