EXTENDED SERIES. 



51 



Cross 3. Parents heterozygous in color factor and in black. YBr 2 BD 2 P 2 A 2 xYBr 2 BD 2 P 2 Ai. 

 Expectation, 9 BAg, 3 BrAg, to 4 W. The parents in this cross were derived from 

 yellows. 



Cross 4. Parents heterozygous in black and density. Y 2 Br 2 BDdP 2 A 2 xY 2 Br 2 BDdP 2 A 2 . 

 Expectation, 9 BAg, 3 BrAg, 3 dBAg, 1 dBrAg. 



Cross 5. Parents heterozygous in dark eye. Y 2 Br 2 B 2 D 2 PpA 2 xY 2 Br 2 B 2 D 2 PpA 2 . Expec- 

 tation, 3 BAg to 1 pBAg. 



Cross 6. Parents heterozygous in color factor, dark eye, and agouti. YBr 2 B 2 D 2 PpAx 

 YBr 2 B 2 D 2 PpA. Expectation, 27 BAg, 9 5,9 pBAg, 3 pB, 16 W. 



Cross 7. Parents heterozygous in black, dark eye, and agouti. Y 2 Br 2 BD 2 PpAxYBr 2 BD 2 PpA. 

 Expectation, 27 BAg, 9 pBAg, 9 BrAg, 9 £, 3 pBrAg, 3 Br, 3 pB, 1 pBr. 



Mating. 



Parents. 



163 

 119 

 175 

 116 

 140 

 162 

 169 



545 x 546 



547 x 546 



548 x 546 



545 or 548 x 546 . . 

 545-547-548 x 546. 

 672-673 x 918 ... . 

 917 x 918 



B. pBAg. 



11 



3 

 1 



3 



pBrAg. 



Br. pB 



1 

 2 

 1 

 2 



1 

 2 



pBr 



