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Retinoschisis is an eye disease characterized by the abnormal splitting of the retina's neurosensory layers, usually in the outer plexiform layer.Retinoschisis can be divided into degenerative forms which are very common and almost exclusively involve the peripheral retina and hereditary forms which are rare and involve the central retina and sometimes the peripheral retina.
Ancillary tests for abnormal structures and physiology can be made via a slit lamp test, which examines the cornea, conjunctiva, anterior chamber, and iris. [ 15 ] [ 16 ] In severe cases of hyperopia from birth, the brain has difficulty in merging the images that each individual eye sees.
Retinitis pigmentosa (RP) is a member of a group of genetic disorders called inherited retinal dystrophy (IRD) that cause loss of vision. [1] Symptoms include trouble seeing at night and decreasing peripheral vision (side and upper or lower visual field). [1]
Genetic mutations are rare causes of certain retinopathies and are usually X-linked including NDP family of genes causing Norrie disease, FEVR, and Coats disease among others. There is emerging evidence that there may be a genetic predisposition in patients who develop retinopathy of prematurity and diabetic retinopathy.
Epigenetic mechanisms. In biology, epigenetics is the study of heritable traits, or a stable change of cell function, that happen without changes to the DNA sequence. [1] The Greek prefix epi-(ἐπι-"over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional (DNA sequence based) genetic mechanism of inheritance. [2]
It has evolved to address more complex questions such as: how important are genetic and/or environmental influences on various human behavioural traits; to what extent do the same genetic and/or environmental influences impact the overlap between human behavioural traits; how do genetic and/or environmental influences on behaviour change across ...
However, there is more genetic diversity in Africa than the rest of the world combined, [82] so speaking of a "Black" race is without a precise genetic meaning. [ 81 ] Qualitative research has fostered arguments that behavioural genetics is an ungovernable field without scientific norms or consensus , which fosters controversy .
Goddard believed that a variety of mental traits were hereditary and that society should limit reproduction by people possessing these traits. The name Kallikak is a pseudonym used as a family name throughout the book. Goddard coined the name from the Greek words καλός (kalos) meaning good and κακός (kakos) meaning bad. [2]