EXTENDED SERIES. 



69 



Cross 68. Both parents heterozj-gous in dark eye. YiBriB^DiPp xY2BriB2d2Pp. Expec- 

 tation, 3 5, 1 -pB. 



Black x pink-eyed black. 

 Cross 69. Both parents homozygous. YiBr-iBiDiPi x Y2Br2BzD2P2- Expectation, all B. 



Mating, i Parents. 



306 



B. 



1695xpl510... 16 



Cross 70. Black heterozygous in dark eye crossed with homozygous pink-eyed black. 

 YnBrnB.DiPp X YiBr-iBiDiPi. Expectation, 1 5, 1 pB. 



Black X brown. 

 Cross 71. Both parents homozygous. YiBr^BiD^Pi X YiBrJDJPi. Expectation, all B. 



Cross 72. Black heterozygous in black crossed with homozygous brown. YiBr^BDiP^. X 

 YzBriDnPi. Expectation, IB, I Br. 



Cross 73. Black, heterozygous in black, dark eye, and the color factor crossed with pink- 

 eyed black heterozygous in the color factor and black. YBrzBDiPp x YBriBD^pi. 

 Expectation, 9 B, 9 pB, 3 Br, 3 pBr, 8 W. 



