Mary marries an unaffected man, Justin, whose paternal uncle has galactosemia. Determine th genotypes for Justin's Family

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.