n6 



Heredity and Environment 



B A 



Fig. 39. X-ray Picture, A of a Normal, B of a Short-fingered 

 (brachydactyl) hand. (From Bateson.) 



normal characters are more striking, more easily followed from 

 generation to generation, and consequently statistics are more 

 complete with regard to them than in the case of normal char- 

 acters. In many cases statistics are not sufficiently complete to 

 determine with certainty whether the character in question is 

 dominant or recessive, and it must be understood that in some 

 instances the classification in this respect is tentative. A par- 

 tial list of these characters is given herewith : 



Mendelian Inheritance in Man 

 normal characters 



Dominant Recessive 



Hair: 

 Curly- 

 Dark 



Eye Color: 

 Brown 



Skin Color: 

 Dark 

 Normal Pigmentation 



Straight 

 Light to red 



Blue 



Light 



Albinism (Fig. 37) 



