In a study by Tzenova et al. ,100 Canadian families were tested for reading ability and potential genetic linkages.They found that two measures of dyslexia in particular showed strong evidence of genetic linkage:

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The study found that spelling and phonological coding showed strong evidence of genetic linkage, suggesting that there may be genetic factors contributing to an individual's difficulty with these specific aspects of reading and writing. The other options listed do not have strong evidence of genetic linkage based on the study mentioned.

In a Study by Tzenova Et Al