One gene influences more than one trait, or rather multiple traits
pleiotropism
Affected individuals have excessive quantity of amino acid in their urine and fluid in blood, short statyre pigmented patches excessive sweating non pigmented hair
Phenlyketonuria
Affects eyes, bones, tisssues thanks to the fibrillin
Marfan syndrome
Human autosomal dominant disorder, individuals cannot metabolize the porphyrin component of hemoglobin
Porphyra variegata
Mutation of a beta-globin gene that causes organ problems
Sickle cell anemia
Effect of a dominant gene that curl feathers
Frizzle trait in chickens