52 



THE INHERITANCE OF COLOR IN MICE. 



Cross 8. Parents heterozygous in color factor, density, and dark eye. YBnBiDdPpAi x 

 YBriB^DdPpAi. Should give 27 BAg, 9 dBAg, 9 pBAg, 3 pdBAg, 16 W. 



Cross 9. Parents heterozygous in density, dark eye, and agouti. YiBriBiDdPpAx 

 YiBriBiDdPpA . Expectation, 27 BAg, 9 pBAg, 9 B, 9 dBAg, 3 pdBAg, 3 dB, 3 pB, 1 pdB. 



Cross 10. Parents heterozygous in black, density, and dark eye. Y2Br2BDdPpA2 x 

 YiBriBDdPpAi. Expectation, 27 BAg, 9 pBAg,^BrAg, 9 dBAg, 3 pdBAg, 3 pBrAg, 

 3 dBrAg, 1 pdBrAg. 



Cross 10a. Parents heterozygous in black, density, and agouti YiBriBDdPoA x YiBr^BDdPxA . 

 Expectation, 27 BAg, 9 dBAg, 9 BrAg, 9 5, 3 d5r.4s?, 3 dB, 3 Br, 1 dBr. 



Black agouti x di7M<e btoc/; agouti. 



Cross 11. Giving only BAg young, both parents homozygous. Y^BriB^D-iPiAzX 

 YiBroBidiPoAi. 



