588 



GENETICS IN RELATION TO AGRICULTURE 



been chosen, then we will obtain the following distribution of males 

 with respect to their genotypes and relative numerical frequencies: 



(1) (ZM)(ZM)LL 27 



(2) (ZM)(ZM)Ll 30 



(3) (ZM)(ZM)tt 7 



(4) (ZM)(Zm)LL 9 



(5) (ZM)(Zm)Ll 6 



(6) (ZM)(Zm)tt 1 



Total 80 



In the next generation, therefore, the probabilities are strongly in 

 favor of the selection of males of types (1) and (2) and the trap-nest 

 records should insure the selection of hens which are mostly of the two 

 genotypes given in the table. At any rate matings will be restricted to 

 types (1) to (6), the inferior types (7) to (9) are excluded. Accordingly 



9D39 (82) X d">6 



9 E232 (69) X c?555 - 



237 (66) X c?654 

 Mean, 62 



9 F265 (48) X J664 



303 (64) X <?66S 



136 (48) 



347 (69) X <?662 



363 (74) X c?567 

 Mean, 61 



9 G10 (100) 

 14 (99) 

 88 (2S) 

 264 (16) 



9 G12 (16) 



19 (70) 



39 (100) 



63 (44) 



81 (84) 



86 (73) 



192 (57) 



213 (29) 



9G18 (61) 



27 (8S) 



46 (116) 



196 (56) 



211 130) 



248 (67) 



9 Gil (47) 

 134 (111) 

 166 (36) 

 198 (39) 

 506 (19) 



Mean, 57.74 



Fio. 226. Pedigree of line D5D39, characterized by high winter egg production. 

 Bold faced figures are band numbers of females, italics of males. Italics in parentheses 

 give the winter egg records. (After Pearl.) 



