296 HEREDITY AND ENVIRONMENT 



MENDELIAN INHERITANCE IN MAN (Continued) 



TERATOLOGICAL AND PATHOLOGICAL CHARACTERS 



Dominant Recessive 



Glaucoma (Internal pres- Normal 

 sure and swelling of 

 eyeball) 

 Coloboma (Open suture Normal 



in iris) 



Displaced Lens Normal 



Ears: 



Normal Deaf-mutism 



Normal Otosclerosis (Thickened 



tympanum with hard- 

 ness of hearing) 



SEX-LINKED CHARACTERS 



Recessive characters, appearing in male when sim- 

 plex, in female only when duplex. 



Normal Gower's Muscular Atro- 



phy 



Normal Haemophilia (Slow clot- 



ting of blood) 



Normal Color Blindness (Dalt- 



onism ; inability to dis- 

 tinguish red from 

 green) 



Normal Night Blindness (Ina- 



bility to see by faint 

 light) 



Normal Neuritis Optica (Pro- 



gressive atrophy of 

 optic nerve) 



