40 



HEREDITY IN RABBITS, RATS, AND MICE. 



TABLE 11. Classification of extracted hooded second Fz young from the cross of 



minus-selected with wild rats. 



TABLE 12. Classification of extracted hooded third F 2 young from a cross of 



minus-selected with wild rats. 



TABLE 13. Grade distribution of Fi young sired by the standard-bred Dutch <?SOS7 

 (grade 7) mated with does transmitting the self (unspotted) condition. 



Mothers designated (E) were English marked and transmitted the self condition in only 

 half of their gametes. The English young of such mothers are omitted from this table. Mothers 

 designated (H) were Himalayan albinos. 



TABLE 14. Grade distribution of the back-cfoss young produced by F\ does 

 (table IS) mated with the standard-bred Dutch buck &30S6 (grade 9). 



2 The number in parentheses indicates the grade (pi. 1) of the animal. 



