Which one is a hereditary disease?
Correct answer: D. Phenylketonuria
- A. Cataract
- B. Leprosy
- C. Blindness
- D. Phenylketonuria
Explanation
The correct option is d) Phenylketonuria. Phenylketonuria (PKU) is a hereditary disease caused by a genetic mutation that affects the metabolism of the amino acid phenylalanine. It is an autosomal recessive disorder, meaning that both copies of the gene must be mutated for an individual to have the condition. PKU is inherited from the parents who carry the mutated gene.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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