EXTENDED SERIES. 



55 



Cross 19. Black agouti heterozygous in color factor, black, and agouti crossed with brown 

 heterozygous in the color factor. YBr 2 BD 2 P 2 A xYBr 2 D 2 P 2 . Expectation, 3 BA g, 

 3 B, 3 BrAg, 3 Br, 4 W. 



Black agouti x dilute brown. 



Cross 20. Black agouti heterozygous in color factor, black, and density crossed with dilute 

 brown heterozygous in color factor. YBr 2 BDdP 2 A 2 xYBr 2 d 2 P 2 . Expectation, 3 BAg, 

 3 dBAg, 3 BrAg, 3 dBrAg, 4 W. 



Cross 20a. Homozygous black agouti x homozygous dilute brown. 



Y 2 Br 2 B 2 D 2 P 2 A 2 xY 2 Br 2 d 2 P 2 . Expectation, all BAg. 



Cross 20b. Black agouti heterozygous in black and density crossed with homozygous dilute 

 brown. Y 2 Br 2 BDdP 2 A 2 x Y 2 Br 2 d 2 P 2 . Expectation, 1 BAg, 1 dBAg, 1 BrAg,[l dBrAg. 



Cross 20c. Black agouti heterozygous in black, density, and agouti crossed with homozy- 

 gous dilute brown. Y 2 Br 2 BDdP 2 A x Y 2 Br2d 2 P 2 . Expectation, 1 BAg, 1 BrAg, 1 dBAg, 

 1 B, 1 dBrAg, 1 Br, 1 dB, 1 dBr. 



