Search results
Results From The WOW.Com Content Network
A genetic disorder is a health problem caused by one or more abnormalities in the genome. It can be caused by a mutation in a single gene (monogenic) or multiple genes (polygenic) or by a chromosome abnormality. Although polygenic disorders are the most common, the term is mostly used when discussing disorders with a single genetic cause ...
The following is a list of genetic disorders and if known, type of mutation and for the chromosome involved. Although the parlance "disease-causing gene" is common, it is the occurrence of an abnormality in the parents that causes the impairment to develop within the child. There are over 6,000 known genetic disorders in humans.
Tay–Sachs disease is a genetic disorder that results in the destruction of nerve cells in the brain and spinal cord. [1] The most common form is infantile Tay–Sachs disease, which becomes apparent around the age of three to six months of age, with the baby losing the ability to turn over, sit, or crawl. [1]
3% of newborns (US) [ 8 ] Deaths. 628,000 (2015) [ 9 ] A birth defect[ a ] is an abnormal condition that is present at birth, regardless of its cause. [ 2 ] Birth defects may result in disabilities that may be physical, intellectual, or developmental. [ 2 ] The disabilities can range from mild to severe. [ 6 ]
The cause of the extra full or partial chromosome is still unknown. [92] Most of the time, Down syndrome is caused by a random mistake in cell division during early development of the fetus, but not inherited, [ 93 ] and there is no scientific research which shows that environmental factors or the parents' activities contribute to Down syndrome.
Fragile X syndrome (FXS) is a genetic neurodevelopmental disorder characterized by mild-to-moderate intellectual disability. [1] The average IQ in males with FXS is under 55, while about two thirds of affected females are intellectually disabled. [3][4] Physical features may include a long and narrow face, large ears, flexible fingers, and ...
Williams syndrome (WS), also Williams–Beuren syndrome (WBS), is a genetic disorder that affects many parts of the body. [2] Facial features frequently include a broad forehead, underdeveloped chin, short nose, and full cheeks. [2] Mild to moderate intellectual disability is observed in people with WS, with particular challenges with visual ...
Most chromosome abnormalities occur as an accident in the egg cell or sperm, and therefore the anomaly is present in every cell of the body. Some anomalies, however, can happen after conception, resulting in Mosaicism (where some cells have the anomaly and some do not). Chromosome anomalies can be inherited from a parent or be "de novo".