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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.
An example of a human characteristics that is extremely heritable is eye color, with a concordance of 98% for MZ pairs and 7–49% for DZ pairs depending on age. [ 27 ] Identical twin studies put autism's heritability in a range between 36% and 95.7%, with concordance for a broader phenotype usually found at the higher end of the range. [ 28 ]
Pitt–Hopkins syndrome (PTHS) is a rare genetic disorder characterized by developmental delay, moderate to severe intellectual disability, [1] distinctive facial features, and possible intermittent hyperventilation followed by apnea. [2] Epilepsy (recurrent seizures) often occurs in Pitt-Hopkins. [1]
Autism spectrum disorder [a] (ASD), or simply autism, is a neurodevelopmental disorder "characterized by persistent deficits in social communication and social interaction across multiple contexts" and "restricted, repetitive patterns of behavior, interests, or activities". [11]
Disability – may be physical, cognitive, mental, sensory, emotional, developmental or some combination of these. Developmental disability – a term used in the United States and Canada to describe lifelong disabilities attributable to mental or physical impairments, manifested prior to age 18. Disorder –
When children with Williams syndrome are asked to name an array of animals, they may well list a wild assortment of creatures such as a koala, saber-toothed cat, vulture, unicorn, sea lion, yak, ibex and Brontosaurus, a far greater verbal array than would be expected of children with IQs in the 60s. [38]
Trisomy 18, also known as Edwards syndrome, is a genetic disorder caused by the presence of a third copy of all or part of chromosome 18. [3] Many parts of the body are affected. [ 3 ] Babies are often born small and have heart defects . [ 3 ]
An example of a family pedigree displaying an autosomal recessive trait. A pedigree is a diagram showing the ancestral relationships and transmission of genetic traits over several generations in a family. Square symbols are almost always used to represent males, whilst circles are used for females.