GENETICS AND EUGENICS 



251 



Data on Human Heredity — Cont'd 



TRAIT 



Skin and Hair — Cont'd 



Albinism (lack of pigment in skin, 



eyes, and hair) 

 Beaded hair 



Ovoid hair form (kinky or wavy) 

 Alopecia (baldness) 



Hair color (brunette or blonde) 



Eed hair 



Eyes 

 Eye color 



Hereditary cataract 

 Color blindness 



Night blindness 



Atrophy of optic nerve 

 Large, irregular pupils 



Ear Structure and Hearing 



Complete absence of external ears 

 Cup ears (small, deformed, inverted 



pinnae) 

 Otosclerosis (progressive hardening 



of ear drums) 



Nervous System 

 Feeblemindedness 

 Amaurotic family idiocy 

 Huntington's chorea 



Manic depressive insanity 



« 



Dementia praecox (schizophrenia) 



Dipsomania 



Diseases and Diatheses 



Hemophilia 



Allergy (predisposition to hay fever, 

 asthma, eczema, migraine, etc.) 



Gower's muscular atrophy 



Diabetes insipidus (excessive produc- 

 tion of urine) 



HOW INHERITED 



Simple 



Simple 



Probably simple 

 Sex-linked 



Plural genes, 

 probably two 

 pair 



Probably simple 



Modifying fac- 

 tors and varia- 

 tion in domi- 

 nance 



Simple 



Sex- linked 



Sex-linked 



Sex-linked 

 Simple 



Simple 

 Simple 



Simple 



Can be simple 



Simple 



Simple 



Plural genes 



Plural genes, 32 

 pair 



Probably simple 



Sex-linked 

 Simple 



Simple 

 Simple 



DOMINANCE 



Recessive to all types of 



pigmentation 

 Abnormality dominant 

 Partial dominance 

 Dominant in men 

 Recessive in women 

 Dark shades dominant 



Red pigment dominant 



Dark shades tend to be 

 dominant over blue 



Abnormality dominant 

 Abnormality usually 



recessive 

 Abnormality usually 



recessive 

 Abnormality recessive 

 Abnormality, an irregu- 

 lar dominant 



Abnormality dominant 

 Abnormality dominant 



Abnormality dominant 



Abnormality recessive 

 Abnormality recessive 

 Abnormality dominant 



Abnormality chiefly dom- 

 inant 



Abnormality seems to oc- 

 cur as an incomplete 

 recessive 



Abnormality recessive 



Abnormality recessive 

 Abnormality dominant 



Abnormality recessive 

 Abnormality dominant 



