EXTENDED SERIES. 73 



Cross 86. Both parents homozygous. Y 2 Br 2 B 2 D 2 p 2 x Y 2 Br 2 D 2 P 2 . Expectation, all B. 



Cross 87. Pink-eyed black heterozygous in black crossed with homozygous brown. 

 Y 2 Br 2 BD 2 p 2 x Y 2 Br 2 D 2 P 2 . Expectation, 1B,1 Br. 



Cross 88. Pink-eyed black heterozygous in the color factor and black crossed with brown 

 heterozygous in color factor. YBr 2 BD 2 p 2 X YBr 2 D 2 P 2 . Expectation, W, 3 Br, 2 W. 



Mating. 



Parents. 



B. Br. 



W. 



269 



1812x1661. 



Cross 89. Pink-eyed black heterozygous in black crossed with brown heterozygous in dark 

 eye. Y 2 Br 2 BD 2 p 2 x Y 2 Br 2 D 2 Pp. Expectation, 1 B, 1 pB, 1 Br, 1 pBr. 



Pink-eyed black x dilute brown. 

 Cross 89a. Both parents homozygous. Y 2 Br 2 B 2 D 2 v 2 x Y 2 Br 2 d 2 P 2 . Expectation, all B. 



