nS 



Heredity and Environment 



MENDELIAN INHERITANCE IN MAN 



NORMAL CHARACTERS 



Recessive 



Dominant 

 Hair: 



Curly Straight 



Dark Light to red 



Eye Color; 



Brown Blue 



Skin Color: 



Dark Light 



Normal Pigmentation Albinism 



Countenance: 



Hapsburg Type (Thick lower Normal 



lip and prominent chin) 

 Temperament: 



Nervous Phlegmatic 



Intellectual Capacity: 



Average Very great 



Average Very small 



TERATOLOGICAL AND PATHOLOGICAL CHARACTERS 



General Size; 

 Achondroplasy (Dwarfs with Normal 



short stout limbs but with 



bodies and heads of normal 



size) 



Normal size True Dwarfs (With all parts of 



the body reduced in proportion) 

 Hands and Feet: 



Brachydactyly (Short fingers Normal (Fig. 38) 



and toes) 

 Syndactyly (Webbed fingers Normal 



and toes) 

 Polydactyly (Supernumerary Normal t^Tg. 37) 



digits) 

 Skin: 

 Keratosis (Thickening of Epi- Normal 



dermis) 

 Epidermolysis (Excessive for- Normal 



mation of blisters) 

 Hypotrichosis (Hairlessness as- Normal 



sociated with lack of teeth) 



