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I am a senior medical sicentist and work with retinal disease. Usher Syndrome is a recessive disease. Recessive diseases require two 'mistakes' in a single gene for a patient to manifest the disease. A dominant disease requires only one 'mistake' in a single gene to manifest the disease. X-linked diseases require a single mistake on the x chromosome. In any case, Usher is recessive. If you have usher, it is likely that you inherited one mistake from you mother and one mistake from your father (they don't manifest the disease themselves as they only have one mistake in the gene, not two). Of course it is also possibloe that you inheirited one mistake from your mother or your father, and the second 'mistake' that you have (if it is yourself with usher) is a new mutation (called a germ line mutation) that originated in the sperm or egg that created you.
To all those people out there who post replies....please do not reply unless you know what you are talking about. Misinformation could be dangerous.
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