1 MCQs in Medicine for NEET PG
A 35-year-old man presents with progressive cerebellar ataxia, dysarthria, and pyramidal signs. His father was diagnosed with spinocerebellar ataxia at age 50, and his paternal grandfather at age 65. Genetic testing confirms SCA1 caused by CAG repeat expansion in the ATXN1 gene. The pedigree pattern shown in the diagram at **A** demonstrates which cardinal feature that explains the progressively earlier age of onset across three generations?
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