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How Genetic Disorders Are Inherited: Recessive Disorders: One Chance in Four  |
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Both parents carry a single defective gene (d) but are protected by the presence of a normal gene (N), which is generally sufficient for normal function. Two defective copies of the gene are required to produce a disorder. Each child has a 50 percent chance of being a carrier like both parents and a 25 percent risk of inheriting the disorder. Illustration: Mary E. Challinor |
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