What account for partial defects of G6PD in females?

Partial defects of G6PD (glucose-6-phosphate dehydrogenase) in females often arise due to X-linked inheritance, where females have two X chromosomes. If one X chromosome carries a mutation leading to G6PD deficiency, while the other is normal, the female may exhibit partial deficiency due to the presence of the normal allele. Additionally, X-inactivation can result in a mosaic pattern of enzyme activity, leading to varying levels of enzyme function in different cells. This results in a less severe phenotype compared to males, who have only one X chromosome and are more likely to express the full extent of the deficiency.