No. 537] 



HAIR FORM AMONG FILIPINOS 



529 



TABLE II 

 Geoup I, Straight X Straight 



father 's father, F.M. = father 's mother, M.F. = 

 mother's father and M.M. = mother 's mother. 



Here are three families (3, 6, 11) in which the parents 

 appear to be simplex or heterozygotes, and' three (19, 20, 

 21) in which they appear to be duplex or homozvgotes, 

 and the straight hair is dominant to the curved variety. 

 The parents in the first three families would have a 

 gametic composition of DrxDr in which D represents 

 the dominant character, straight hair, and r represents 

 the recessive, curved hair. In any cross of this nature an 

 equal number of children with straight hair and with the 

 curved variety would be expected and the expectation is 

 realized. The parents in the second three families would 

 have a gametic composition of DDxDD, where D repre- 

 sents the dominant character, straight hair, and only 

 straight-haired children should result from such unions. 

 The gametic composition of the last three families could 

 be rrXrr, where r is recessive straight hair, but if 

 >trai.u'ht hair acts as the dominant character in the first 

 three families there is no reason to suppose that it would 

 be recessive in the last three. 



TABLE III 



Groups II and III, Curly x Curly and Wavy x Wavy 



