No. 537] 



HAIR FORM AMONG FILIPINOS 



527 



proportion, for of the five families where wavy hair is 

 crossed with curly, there are 33 children with hair of the 

 curved variety and eight with straight hair. 



When individual families are considered, however, 

 there seems to be an alteration of the dominance in some 

 cases. Straight hair is dominant in some families, whereas 

 in others the wavy or curly is dominant. In Table I 

 straight hair appears to be dominant in the families num- 

 bered 3, 6, 11, 18, 24, 25, 26, 27, 31, 34, 38 and 45. In the 

 first three of these families where both parents have 

 straight hair, and particularly in family 6, curly hair is 

 evidently recessive. If the gametic composition of the 

 two parents in family 3 is DrXDr, in which D = straight 

 hair dominant and r = curly hair recessive, then the 

 expected proportion of offspring would be 3 straight to 1 

 curly haired child. The number of curly-haired children 

 is 3 instead of 1, which is greater than it should be. But 

 if the straight hair be recessive in this family, the gametic 

 composition must be rrXrr where r is straight recessive, 

 and all of the children should have straight hair, which 

 is not true. In any case the number of curly-haired chil- 

 dren is in excess of what it should be. 



The curved form of hair seems to be dominant in a 

 greater number of families than is the straight, as in 

 families numbered 1, 4, 10, 12 to 16, 22, 28, 29, 33, 35, 36, 

 39, 41, 43 and 44. In family 1 the proportion of curly- 

 haired children is in excess (excessive dominance) of 

 what it should be even though the curved be dominant. 

 The same is also true for families 4, 10, 13 and 39. There 

 is, on the other hand, imperfect dominance (recessive 

 dominance) of the curved hair in families 14, 15, 16 and 

 29; or, in other words, there are fewer children with 

 curved hair in these families than would be anticipated 

 if the curved form be dominant. 



When kinky hair and straight hair are crossed, as in 

 families 17 and 32, there results an intermediate form- 

 in one family all the children have curly hair, in the other 

 all have wavy hair. The result of crossing two of these 



