Predisposition to a disease means that a person has some genetic, hereditary, predisposition to an illness and this can make itself manifest simply from genes. They are likely to contract it due to hereditary factors.
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Individuals predisposed to a disease have a genetic makeup that increases their likelihood of contracting that disease. This predisposition is often inherited and influenced by environmental and lifestyle factors. However, having a genetic predisposition does not mean that an individual will definitely develop the disease.
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