SEX-LIMITED HEREDITY IN CERTAIN CROSSES. 



145 



130 and 131. It will be seen that brown and white offspring appear in a nearly 

 3 : 1 ratio (49 to 18) and that all of the white young of known sex (7) were females. 

 Some of the brown birds of known sex (5 to 19) were also females. That the 

 "brown" birds were by no means the equivalent of pure St. risoria will be made 

 clear by a reference to pi. 25. 



Table 127. 



9 A 1. 4/9/96; dark brown; 172 ^ 

 d'A 2. 4/11/96; light brown; 167 

 9 B 1. 5/14; dark brown; 177 g. 

 cf B 2. 5,'IU; light brown; 154 g. 

 9C 1. 6/21; dark brown; 157 g. 

 9 C 2. 0/23; dark brown; 153 g. 

 9 D 1. 7/29; dark brown; 142 g. 

 9D2. 7/31; light brown; 176 g. 



T.\BLE 128. 

 (f St. risoria (X) : (155 gr.inis wt.). 

 9 St. alba (W2): (151g. wt.). 



E 1. 9/4; unhatched. 

 E2. 9/G; dark. 

 F 1. 11/26; deserted. 

 F2. 11/28; deserted. 



G 1. 1/4/96; killed by cold. 

 G 2. 1/6/96; killed by cold. 



Table 129 — Color and sex of offspring of alba-risoria hybrid males x risoria-alba hybrid females. 



cT alba X risoria (WDLF 2); light brown; 8/16/96; 6/2S/99. 



cfBl. 

 9B2. 

 d'Cl. 

 cfC2. 



5/9/97; not batched. 

 5/11/97; record indefinite. 

 6/11; light brown. 

 6/13; light brown. 

 7/20; brown. 

 7/22; brown. 

 8/25; white. 

 8/27; brown. 



: alba (XW 2 D 1 ; dark brown; 

 F 1. 1/8/98; no development. 

 F 2. 1/10/98; brown. 



6/7, brown. 

 6/9; brown. 



10/5; white. 

 10/7; white. 

 10/27; hatched. 

 10/29; hatched. 



N. 4/9/99; no record. 



O 1. 4/20; no test. 

 O 2. 4/22; no test. 



PI. 5/27; white.' 

 P2. 5/29; bro 



(C 7/13. P 16) 



