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Muscular dystrophy
How does muscular dystrophy cause mental retardation in some cases?
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209987_tn?1451939065
It doesn't really "cause" it. It's sort of hard to explain, but it's linked to chromosomes.

Many "diseases" are linked to chromosomes...too many, too few, etc.
Sometimes the " right/wrong" chromosomes are affected and someone will develop more than one type of  "disease/problem"

Down's syndrome/mental retardation, is caused when the 21st chromosome is tripled...they have 3 copies of chromosome 21 instead of 2...also called trisomy 21.

Some forms of MD are caused by genetics.
Trisomy 21 is a "genetic" type of thing...so it's possible to have many problems/diseases if you have that extra chromosome 21.

Hope this helped, rather than to make you more confused.
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