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If the parents are both right-handed, in dizygotic and monozygotic twins there is a 21% chance of one being left-handed. If one parent is left-handed, in DZ and MZ twins there is a 57% chance of one being left-handed. If both parents are left-handed, it is almost certain one twin will be left-handed. [citation needed]
Congenital myasthenic syndrome (CMS) is an inherited neuromuscular disorder caused by defects of several types at the neuromuscular junction. The effects of the disease are similar to Lambert-Eaton Syndrome and myasthenia gravis , the difference being that CMS is not an autoimmune disorder .
Into the 20th and even the 21st century, left-handed children in Uganda were beaten by schoolteachers or parents for writing with their left hand, [122] or had their left hands tied behind their backs to force them to write with their right hand. [123] As a child, the future British king George VI (1895–1952) was naturally left-handed. He was ...
Over the centuries, many cultures disparaged left-handedness and tried to force lefties to become right-handed. In English, the word "right" also means "correct" or "proper."
Rubinstein–Taybi syndrome, in many cases, is a microdeletion syndrome involving chromosomal segment 16p13.3 and is characterized by mutations in the CREBBP gene. [ 11 ] [ 12 ] Varying amounts of material are deleted from this section of the chromosome and account for the spectrum of physiological symptoms.
Consequently, patients with this movement disorder have serious difficulty carrying out tasks that require manual dexterity or precision, such as playing a two handed musical instrument or typing on a keyboard, for their whole lives. [4] [6] Patients also often experience discomfort or pain in the upper limbs due to prolonged use of the same ...
Amplified musculoskeletal pain is a syndrome which is a set of characteristic symptoms and signs. Essentially, the syndrome is characterized by diffuse, ongoing, daily pain associated with relatively high levels of incapability and greater care-seeking behavior.
A study done by the Department of Neurology at Keele University, North Staffordshire Royal Infirmary suggests that forced dextrality may be part of the reason that the percentage of left-handed people decreases with the higher age groups, both because the effects of pressures toward right-handedness are cumulative over time (hence increasing ...