EFFECTS OF INBREEDING ON THE SEX RATIO 



11 



TABLE 4 



Showing the sex ratios in the inbred and in the half-inbred litters produced in each 

 of the first twenty-five generations of the A series of inbreds 



As the number of individuals in each of the first seven genera- 

 tions of the A series was comparatively small, it is not surprising 

 that the sex ratios in the inbred and in the half-bred groups of 

 litters should show a wide range of variation (table 4) . When the 

 records for these generations were combined, as shown in table 

 6, it was found that the 144 inbred litters had a sex ratio of 110.4 cf : 



