THE INHERITANCE OF FAMILY TRAITS 



145 



lished (Rischbieth, 1909) yet they are not as critical as one 

 would like (Figs. 120, 121), particularly, the consorts are 



OrO 



&m 



s^ 



DiO 



3 



Fig. 120. — Pedigree of a family with harelip (right half of symbol dark) 

 and cleft palate (left half dark). Frequently the affected persons descend from 

 affected parents. Apert, 1907, after Schmitz. 



rarely given. One can say, however, that the defect seems 

 not to be sex-limited. So often are some of the children 



I 



m 



bfr 



it! 



iHi¥lM 



F^SSMi 



Fig. 121. — Pedigree of harelip (sohd black symbol) and cleft palate (half 

 black symbol). The type of defect is not constant. I, 2, simple fissure; II, 3, 

 bilateral fissure; III, 1, palatine fissure; III, 3-7, lip fissures; IV', 4, harelip 

 with cleft palate; IV, 6, 7, palate cleft without harelip. This particular 

 pedigree is interesting because of an alternation of the affected sex in successive 

 generations. Schmitz, 1904. 



of one affected parent defective that the first impression is 

 that the trait is dominant. But, if so, two normals should 



