In phenylketonuria, phenylalanine accumulates in the cells leading to mental retardation as the brain fails to develop:
Correct answer: C. In infancy
- A. During embryonic development
- B. In childhood
- C. In infancy
- D. During puberty
Explanation
Phenylalanine accumulates during infancy in post embryonic development as during embryonic phase phenylalanine is metabolized by mother and fetus gets metabolized food. Thus phenylketonuria occurs in infancy as an in born error of metabolism.
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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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