I. FILIPINO TYPES : MANILA STUDENTS. 



283 



MEiYDBLISM AND STUDENT TYPES. 



When the types of Manila Students are compared with the polyhybrids 

 resulting from the crossing of two unlike tomato plants, great similarity 

 in the number of pol3'hybrids and in their relative proportions is found. 



Price and Drinkard(24) obtained eight forms of tomato plants upon 

 crossing the Yellow Pear which is "characterized by pyriform shape and 

 yellow color of fruit and green foliage" with the Honor Bright which 

 "possesses the three opposite attributes of round or spherical fruit shape, 

 red fruit color, and yellow foliage color." "In this cross there was noted 

 complete dominance of green foliage color, red fruit color, and round 

 fruit shape." 



Suppose the green foliage color represents small stature, the red fruit 

 color represents the round head, and the round fruit shape represents the 

 broad nose; then the three characters combined represent the Primitive 

 and Modified Primitive types. The three opposite characters, tall stature, 

 long head, and narrow nose, represent a hypothetical type not present 

 among the Filipino Students, but which conforms to the Nordic type of 

 Deniker in Europe. 



If two such types have crossed to firoduce the Filipino^ then all pos- 

 sible combinations of the charactej'S constituting the two types should be 

 found according to Mendel's law of polyhybrids as formulated by Price 

 and Drinkard: 



"When parents differing with respect to more than one pair of char- 

 acters are crossed all possible combinations of these characters tvill be 

 found in the F ^ generation and these combinations luill occur in a definite 

 numerical proportion." The following table shows the theoretical re- 

 quirements for a Mendelian trihybrid, the actual proportions secured 

 from 40 plants of the tomato as a result of the cross of the Yellow Pear 

 and Honor Bright by Price and Drinkard, and the proportion of each 

 type found among 377 students of the Trade and Normal Schools at 



Manila. 



Uendelism and Student Types. 



Theoretical 

 result for 

 64 individ- 

 uals. 



Tomato hybrids, 40 plants. 



Per cent. 

 42 

 14 

 14 

 14 

 5 

 5 



1 5 



1 



Green foliage red and round fruit 



Per cent. 

 37.5 

 7.5 

 25.0 

 17.5 

 2.5 

 2.5 

 5.0 j 

 2.5 . 





Green foliage vellow and round fruit 











Yellow foliage yellow and pear fruit 





