62 



THE INHERITANCE OF COLOR IN MICE. 



Cross 43. Pink-eyed black agouti heterozygous in agouti crossed with brown heterozygous 

 in dark eye. Y 2 Br 2 B 2 D 2 p 2 A X Y 2 Br 2 D,Pp. Expectation, 1 BAg, IB, I pBAg, 1 pB . 



Cross 44. Pink-eyed black agouti heterozygous in density crossed with brown heterozygous 

 in density. YzBrJSiDdjhAi x Y 2 Br 2 DdP 2 . Expectation, 3 BAg, 1 dBAg. 



Cross 45. Pink-eyed black agouti heterozygous in black, density, and agouti crossed with 

 brown heterozygous in density. Y 2 Br 2 BDdp 2 A x Y 2 Br 2 DdP 2 . Expectation, 3 BAg, 

 3 BrAg, 3B,3 Br, 1 dBAg, 1 dBrAg, 1 dB, 1 dBr. 



Cross 46. Pink-eyed black agouti heterozygous in density and agouti, crossed with brown 

 heterozygous in density. Y 2 Br 2 B 2 Ddp 2 A x Y 2 Br 2 DdP 2 . Expectation, 3 BAg, 3 B, 

 1 dBAg, 1 dB. 



IV. Pink-eyed Dilute Black Agouti, YBBrdpA (Fig. 4). 



Eyes pink; ears, feet, and tail apparently unpigmented. The color of the coat is markedly 

 washed-out in quality. The agouti pattern is distinguishable, but not easily so, because 

 of the "streaky" due to the absence of intense pigmentation. The whole coat resembles 

 a little that of a very light dilute dark-eyed brown agouti. The ear tufts of yellowish 

 hair are prominent. There are no crosses to be included under this variety, though 

 some in which one parent is pink-eyed dilute black agouti have been recorded under the 

 preceding varieties. 



V. Brown Agouti, YBrDPA (Fig. 5). 



Eyes a deep rich brown, ears brown pigmented. Hairs on ventral surface yellowish on tip, 

 dull brown at base. Tail brown pigmented. Dorsal hairs brown at the tip, then a 

 yellow band, and finally dull brown to the base, giving the unmistakable "ticked" or 

 "agouti" coat. Whiskers and feet are brown. Light hairs around the anus and at the 

 base of the ears. 



