EXTENDED SERIES. 



51 



Cross 3. Parents heterozygous in color factor and in black. YBriBDiPiAixYBriBDiP^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. YiBnBDdPiAt xYiBr-iBDdPiAz. 

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



Cross 5. Parents heterozygous in dark eye. YiBr2BiD2PpAi xYiBriB^DiPpAo.. Expec- 

 tation, ?, BAg to 1 vBAg. 



Cross 6. Parents heterozygous in color factor, dark eye, and agouti. YBriB-DiPpAx 

 YBriBiDJ'pA. Expectation, 27 BAg, 9 5, 9 pBAg, 3 pB, 10 W. 



Cross 7. Parents heterozygous in black, dark eye, and agouti. YiBriBDiPpA x YBriBD2PpA . 

 Expectation, 27 BAg, 9 pBAg, 9 BrAg, 9B,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 



917x918 



pBAg. 



1 

 o 



pBrAg. 



Br. 



pB I pBr. 



1 

 2 

 1 

 2 



1 

 2 



9 4 



