His parents maybe a having the genotypes of GG and Gg. Galactosemia is a dominant allele so whoever gets the dominant allele, that person is positive to the disorder. Having a parent who is dominant homogeneous alleles crossed by a carrier could have a higher probability to have a child who will inherit this gene.
During Light reactions of Photosynthesis, the chlorophyll will be activated by light. This light activated chlorophyll will split the water molecule. This is called Photolysis. Water molecule is split to release H+ ions and also oxygen.
