Figure 1. Incidence of protoporphyria in a particular family Protoporphyria is a genetic disorder characterized by an extreme sensitivity to sunlight. One form of protoporphyria is caused by a mutation in the ALAS2 gene that results in the accumulation of protoporphyrin, an organic compound, in the blood, liver, and skin. The pedigree in Figure 1 shows the incidence of protoporphyria in a particular family.

Which of the following best describes the genotype of the individual identified with an asterisk in the pedigree in Figure 1 ?