EXTENDED SERIES. 



69 



Cross 68. Both parents heterozygous in dark eye. YiBriBiDiPp x YJiriBiCkPp. Expec- 

 tation, 3 B, 1 pB. 



Mating. 



Parents, i B. pB. 



197 i 1363x1435..! 4 1 1 



Black X pink-eyed block. 

 Cross 69. Both parents homozygous. YiBviBiDiPi. x YiBriBiD^pi. Expectation, all B. 



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

 YiBTiBiDiPp X YiBnBiDsPi. Expectation, 1 B, 1 pB. 



Black X brown. 

 Cross 71. Both parents homozygous. YiBr^BiDiPi x YiBriDiP^. Expectation, all B. 



Cross 72. Black heterozygous in black crossed with homozygous brown. YzBriBDiPi x 

 YiBnDiPi. Expectation, I B, 1 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. YBriBD^Pp x YBrJBDipi. 

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



