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B
3000
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C
100
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D
150
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Solution
The correct option is B 3000
A person who has one defective and one functioning version of such a gene, known as a carrier, suffers little or no ill effects. But each child of two carriers has a one in four chance of inheriting two defective genes and suffering from the disease. Over 3,000 single-gene, or monogenic, diseases have been identified.