▁may ▁be ▁somewhat ▁imp a ired ▁e 1 : ▁Eb ony ; ▁black ▁body ▁and ▁wings ▁( h eter o zy g otes ▁are ▁also ▁vis ibly ▁dark er ▁than ▁wild ▁type ) ▁S b 1 : ▁St ubble ; ▁br ist les ▁are ▁shorter ▁and ▁th icker ▁than ▁wild ▁type ▁w 1 : ▁White ; ▁eyes ▁lack ▁p ig ment ation ▁and ▁appear ▁white ▁b w : ▁Brown ; ▁eye ▁color ▁determined ▁by ▁various ▁p ig ments ▁combined . ▁y 1 : ▁Y ellow ; ▁body ▁p ig ment ation ▁and ▁wings ▁appear ▁yellow , ▁the ▁fly ▁analog ▁of ▁al bin ism ▁ ▁Classic ▁gen etic ▁mut ations ▁ ▁D ros oph ila ▁gen es ▁are ▁tradition ally ▁named ▁after ▁the ▁phen ot ype ▁they ▁cause ▁when ▁mut ated . ▁For ▁example , ▁the ▁absence ▁of ▁a ▁particular ▁gene ▁in ▁D ros oph ila ▁will ▁result ▁in ▁a ▁mut ant ▁emb ry o ▁that ▁does ▁not ▁develop ▁a ▁heart . ▁Scient ists ▁have ▁thus ▁called ▁this ▁gene ▁tin man , ▁named ▁after ▁the ▁O z ▁character ▁of ▁the ▁same ▁name . ▁Like wise ▁changes ▁in ▁the ▁Sh aven b aby ▁gene ▁cause ▁the ▁loss ▁of ▁d ors al ▁cut icular ▁hair s ▁in ▁D ros oph ila ▁se ch ell ia ▁lar va e . ▁This ▁system ▁of ▁nom en cl ature ▁results ▁in ▁a ▁wider ▁range ▁of ▁gene ▁names ▁than ▁in ▁other ▁organ isms . ▁Ad h : ▁Al co hol ▁de h ydro gen ase - ▁D ros oph ila