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Explain the difference between recurring-phase and sequential stage theories.
Huntington Disease
Hereditary disease characterized by chorea (ceaseless involuntary jerky movements) and progressive dementia, ending in death.
Tay-Sachs Disease
Inherited birth defect caused by the loss of genes that encode the enzyme necessary for breaking down certain fatty substances; appears 4 to 6 months after birth and results in intellectual disability, physical changes, and death by about age 5.
Genetic Errors
Flaws or mutations in an organism's DNA sequence that can lead to diseases, disorders, or physical variations.
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