Genetics of dyseidetic dyslexia.

The nine pedigrees presented here suggest an autosomal dominant mode of transmission for the dyseidetic type of dyslexia. Sex-influence probably accounts for the high male to female ratio. Other modes of transmission are highly unlikely for dyseidesia but possible for other types of dyslexia, with the multifactorial mode being most likely. Genetic counseling is particularly feasible in cases of dyseidetic dyslexia.