140 



FAMILY STUDIES IN BUILD. 



medium build. Thus the Father belongs to a fleshy strain, but he probably 

 carries some non-fleshy gametes. 



IV 11 is the Mother; her formula is 160/65.5 inches; build 2.6 (37); 

 fleshy; she has 2 sibs, both fleshy; her parents are of medium build; they 

 have some slender grandchildren. 



There are 8 children, V 3 to 12, whose sex and indices of build are as 

 follows: $ 3.6 (51), 9 3.1 (44), 2 $ $ 2.5 (35), 3 9 9 2.3 (32), 

 9 2.2 (31). Thus 2 are very fleshy and 6 are of medium build. The 



Fig. 49. — Pedigree chart showing distribution of build in the Wen family. (Gen I 1 should be 



square ruled, indicating fleshiness). 



interval between the two groups is a wide one, indicating a clear genetic 

 difference between them. The very fleshy brother, who weighs 265 pounds, 

 was able to reduce about 60 pounds to be accepted for army service, but 

 since being discharged from the army he has rebounded to his former 

 weight. (A : 032-25.) 



Summary and Discussion. 



In a simple monohybrid with complete dominance the back-cross 

 upon the recessive gives 50 per cent of the heterozygous dominant and 

 50 per cent of the recessive allelomorph. In a monohybrid with 

 imperfect dominance the back-cross upon the recessive gives 50 per 



