EXTENDED SERIES. 



55 



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

 heterozygous in the color factor. YBriBDiPiA xYBriD^Pi. Expectation, 3 BAg, 

 3B,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^BDiiPiAi x YBr,diP.i. Expectation, 3 BAg, 

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



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



YsBriBiDiPaAi xYiBridiPi. Expectation, all BAg. 



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

 brown. Y%BriBDdPiAi x Y^BrdiPi. Expectation, lBAg,\ dBAg, 1 BrAgJl dBrAg. 



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

 gous dilute brown. YJBr^BDdPiA x Y^Br^diPi. Expectation, 1 BAg, 1 BrAg, 1 dBAg, 

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



