Answer: phenylalanine into tyrosine.
- A tyrosine into melanin pigment
- B phenylalanine into tyrosine
- C glucose into glycogen
- D galactose into glucose
Correct answer: B. phenylalanine into tyrosine
Explanation: In phenylketonuria the enzyme converting phenylalanine to tyrosine is absent, so phenylalanine and its derivatives accumulate and cause mental impairment.
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →