Down's syndrome Human condition caused by a chromosomal abnormality. It gives rise to varying degrees of mental retardation, decreased life expectancy, and perhaps physical problems, such as heart and respiratory disorders. The syndrome was first described by a British physician, J. L. H. Down. It is caused by the presence of an extra copy of chromosome 2l, and detected by counting chromosomes in the cells of the fetus during pre-natal testing. There is evidence that the risk of having a Down's child increases with maternal age. Originally called ‘Mongolism’ by Down, this term is now obsolete.
More From encyclopedia.com
Pataus Syndrome , Definition Patau syndrome, also called trisomy 13, is a congenital (present at birth) disorder associated with the presence of an extra copy of chrom… Birth Defects , Birth defects, or congenital defects, are abnormalities that are present at birth. They may be the result of genetic factors such as an inherited dis… Down Syndrome , Down syndrome is the most common cause of mental retardation. It can be caused by the presence of an extra chromosome . Chromosomes contain sequences… Downs Syndrome , DEFINITION Down's syndrome is the most common cause of mental retardation (see mental retardation entry) and malformation in newborns. It occurs beca… Congenital , The term congenital is used to describe a condition or defect that exists at birth . Congenital disorders are inborn. They are present in the develop… Marfan Syndrome , Definition Marfan syndrome is an inherited disorder of the connective tissue that causes abnormalities of a child's eyes, cardiovascular system, and…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like