A 4-year-old boy from Kerala presents with acute jaundice, dark urine, and pallor 2 days after receiving sulfamethoxazole for a urinary tract infection. His mother is clinically well but has a brother with a history of neonatal jaundice. The pedigree pattern shown in the diagram is marked **A**, indicating the inheritance pattern of G6PD deficiency. Which of the following best explains why the mother is phenotypically normal despite carrying the mutation?
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