Allele	Phenotype
Drosophila white gene Allows accumulation of red eye pigment	Non-mutant	Dark red eyes
	10% activity mutant	Pale orange eyes
	Loss-of-function mutant	White eyes
Human gene responsible for producing brown hair pigment	Non-mutant	Dark brown hair
	10% activity mutant	Light brown hair
	Loss-of-function mutant	Blonde hair
Human gene responsible for producing brown skin pigment	Non-mutant	Dark brown skin
	10% activity mutant	Light brown skin
	Loss-of-function mutant	Pale skin
Aster gene responsible for producing blue flower pigment	Non-mutant	Blue flowers
	10% activity mutant	Pale blue flowers
	Loss-of-function mutant	White flowers