74 



THE INHERITANCE OF COLOR IN MICE. 



Pink-eyed black x pink-eyed brown. 

 Cross 90. Both parents homozygous. Y^BriBiDipi x Y^BriDipi. Expectation, all pB. 



Cross 90a. Pink-eyed black heterozygous in black, crossed with homozygous pink-eyed 

 brown. Y2BriBD2P2 X YiBrJiipi. Expectation, 1 pB, 1 pBr. 



XII. Pink-eyed Dilute Black, YBrBdp (Fig. 12). 



Eyes pink; ears, tail and feet extremely lightly pigmented. Coat clearly washed out in 

 appearance, and a real bluish lilac, at times almost silvery. This variety is very 

 characteristic, and is one which, when obtained, is easy to recognize. No one would, 

 without breeding tests, class this form as possessing black pigment. 



Pink-eyed dilute black x brown. 



Cross 91. Homozygous pink-eyed dilute black crossed with brown, heterozygous in density. 

 YiBriBidiPi x YiBrJidPt. Expectation, 1 J?, 1 dB. 



Pink-eyed dilute black x dilute brown. 



Cross 91a. Pink-eyed dilute black heterozygous in black crossed with dilute brown hetero- 

 zygous in dark eye. YiBriBdipi x YiBridiPp. Expectation, 1 dB, 1 dBr, 1 pdB, 

 1 pdBr. 



