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PKU
Recessive
Brain damage and severe intellectual impairment
Treated by diet
Tay Sachs Disease
Recessive
Lack of enzyme that breaks down fatty acids
Normal development until go blind, deaf, and can’t swallow, mental impairment
Fatal by age 4
Huntington’s Disease
Dominant
Clumsy and forgetful to deterioration in muscle control, IQ, Brain atrophy
Fatal in 10-20 years
Duchenne Muscular Dystrophy
Sex-linked recessive
Muscle weakness