No. 497] HEREDITY OF HAIR FORM 345 



We can now formulate the results of this study in their 

 relation to human marriage, combining them in part with 

 those obtained by us for eye color. Two blue-eyed, 

 straight-haired parents will have only blue-eyed, straight- 

 haired children. Two wavy-haired parents may have 

 straight, wavy- or curly-haired children but the chances 

 for curly hair are slight. Two curly-haired parents may 

 have children with either straight, wavy or curly hair 

 and the proportion of curly-haired offspring will prob- 

 ably be large. When one parent has straight hair and 

 the other curly hair the offspring will all have curly hair, 

 if the curly-haired parent is homozygous— otherwise half 

 of their children will have straight hair and half curved. 

 But the families of straight and wavy haired parents will 

 probably have straight as well as wavy and curly hair, 

 for waviness is always heterozygous. 



