76 



THE INHERITANCE OF COLOR IN MICE. 



Cross 96. Both parents heterozygous in density and dark eye. Y 2 Br>DdPp x Y 2 Br 2 DdPp. 

 Expectation, 9 Br, 3 dBr, 3 pBr, 1 pdBr. 



Brown x pink-eyed brown. 

 Cross 97. Brown heteroz3'gous in density, dark eye and the color factor, crossed with pink- 

 eyed brown heterozygous in density and the color factor. YBr 2 DdPp x YBr 2 Ddp 2 . 

 Expectation, 9 Br, 9 pBr, 3 dBr, 3 pdBr, 8 W. 



Brown x pink-eyed dilute brown. 

 Cross 97a. Both parents homozygous. Y 2 Br 2 D 2 P 2 x Y 2 Br 2 d 2 p 2 . Expectation, all Br. 



Mating. 



Parents. 



Br. 



583 



Unmarked x unmarked 13 



Cross 97b. Brown heterozygous in density crossed with homozygous pink-eyed dilute 

 brown. Y 2 Br 2 DdP 2 x Y 2 Br 2 d 2 p 2 . Expectation, 1 Br, 1 dBr. 



XIV. Dilute Brown, YBrdP (Fig. 14). 



Eyes brown; ears, tail and feet, as in the dilute brown agouti, are lightly pigmented with 

 brown. Ventral hairs pale fawn. Dorsal hairs dull, washed-out brown, at times 

 resembling a dark, pink-eyed black in general superficial coloration. Ear tufts barely 

 distinguishable from the rest of the coat. The skin is moderately pigmented with brown. 



Dilute brown x pink-eyed brown. 



Cross 98. Both parents homozygous. YiBr 2 d 2 P t x Y 2 Br 2 D 2 p 2 . Expectation, all Br. 



