EXTENDED SERIES. 



51 



Cross 3. Parents heterozygous in color factor and in black. YBr^DiPiAiXYBriBDiPiA,. 

 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. YiBriBDdP^Ai xYiBriBDdPzAi 

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



Cross 5. Parents heterozygous in dark eye. YJBrJBiDiPpAi xYSrJBiDiPpAi. Expec- 

 tation, 3 BAg to 1 pBAg. 



Cross 6. Parents heterozygous in color factor, dark eye, and agouti. YBrJiJiiP-pAx 

 YBtiBiDiPvA. Expectation, 27 BAg, 9 B, 9 pBAg, 3 pB, 16 W. 



Cross 7. Parents heterozygous in black, dark eye, and agouti. YiBriBD^^PpA x YBrsBD^PpA . 

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



