EXTENDED SERIES. 



63 



Brown agouti x hrown agouti. 

 Cross 47. One or both parents homozygous. Y^BriDiP^Ai x YJBnDtPiAi. Expectation, 

 all brown agouti. 



Cross 48. Both parents heterozygous in agouti. YiBriDiP^A x YiBriDJP^A. Expecta- 

 tion, 3 BrAg, 1 Br. 



Cross 49. Both parents heterozygous in density and the color factor. YBrJidPtAi x 

 YBriDdPiAi. Expectation, 9 BrAg, 3 dBrAg, 4 W. 



Cross 49a. Both parents heterozygous in density, dark eye, and agouti. YzBriDdPpA. 

 Expectation, 27 BrAg, 9 dBrAg, 9 pBrAg, 9 Br, 3 pBr, 3 pdBrAg, 3 dBr, 1 pdBr. 



Brown agovii x pink-eyed hrown agouti. 

 Cross 50. Brown agouti heterozygous in dark-eye, color factor, and agouti crossed with 

 pink-eyed brown agouti heterozygous in the color factor and agouti. YBriD^PpA x 

 YBrJ)ipiA. Expectation, 9 BrAg, 9 pBrAg, 3 Br, 3 pBr, 8 W. 



