Which of the following causes hereditary defects such as cystic fibrosis,phenylketonuria,and Tay-Sachs disease?

Name: Which of the following causes hereditary defects such as cystic fibrosis,phenylketonuria,and Tay-Sachs disease?
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Hereditary defects such as cystic fibrosis, phenylketonuria, and Tay-Sachs disease are caused by recessive genes. This means that a person must inherit two copies of the mutated gene (one from each parent) to develop the disease.

Which of the Following Causes Hereditary Defects Such as Cystic