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The underlying causes of the disorder are not fully understood, [15] but dysgraphia is known to have genetic causes. [3] More specifically, it is a working memory problem [13] caused by specific neurodevelopmental dysfunction. [9] In dysgraphia, individuals fail to develop normal connections among different brain regions needed for writing. [13]
This disorder is also generally concurrent with disorders of reading and/or mathematics, as well as disorders related to behavior. Since it is so often associated with other learning disorders and mental problems, it is uncertain whether it can appear by itself; [3] and dysgraphia can be considered to be a specific form of the disorder. [4]
The Y-STR markers in the following list are commonly used in forensic [1] and genealogical DNA testing.. DYS454 is the least diverse, and multi-copy marker DYS464 is the most diverse Y-STR marker.
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Research into potential genetic causes of dyslexia has its roots in post-autopsy examination of the brains of people with dyslexia. [37] Observed anatomical differences in the language centers of such brains include microscopic cortical malformations known as ectopias , and more rarely, vascular micro-malformations, and microgyrus —a smaller ...
Dyscravia [1] is a voicing substitution dysgraphia, i.e. a type of writing disorder in which the affected person confuses letters denoting sounds that differ in their voicing attribute (e.g. writing "dap" instead of "tap" or "tash" instead of "dash").
Dysgraphia - National Institute on Deafness and Other Communication Disorders Archived 2016-12-02 at the Wayback Machine; Voice and Speech Disorder Online Community (VoiceMatters.net) List of communication disorder related links; Child Language Disorders
[1] (a) Pie charts on the map. (b) Counts of haplogroups in table format. For populations details, see 1000 Genomes Project#Human genome samples. In human genetics, a human mitochondrial DNA haplogroup is a haplogroup defined by differences in human mitochondrial DNA. Haplogroups are used to represent the major branch points on the ...