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) (2M)(ZM)LL.......... 27 
(2) (ZM)(ZM)LI.. 
(3) (ZM)(ZM)u... 
(4) (2M)(Zm)LL 
(5) (Z2M)(Zm)LI.. 
(6) (ZM)(Zm)ll... 
Aman naarne all) 
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 
9 D39 (62) X «DB 
237 (55) X Sb54 
Mean, 62 
Q F255 (48) & S564 | 
Q E232 (69) xX 7555 — 0 
303 (64) X #563 
136 (48) 
347 (69) X S562 
l 
363 (74) X 567 | 
Mean, 61 
2 G10 (100) 
14 (99) 
88 (23) 
254 (16) 
2 G12 (16) 
19 (70) 
39 (100) 
53 (44) 
81 (34) 
85 (73) 
192 (57) 
213 (29) 
2G18 (61) 
27 (83) 
46 (116) 
196 (56) 
211 (36) 
248 (67) 
G11 (47) 
134 (111) 
165 (36) 
198 (39) 
506 (19) 
Mean, 57.74 
Fig. 226.—Pedigree of line D5D39, characterized by high winter egg production. 
Bold faced figures are band numbers of females, italics of males. 
give the winter egg records, (After Pearl.) 
Digitized by Microsoft® 
Italics in parentheses 
