72 



THE INHERITANCE OF COLOR IN MICE. 



Dilute black x pink-eyed brown. 



Cross 82. Dilute black heterozygous in black crossed with homozygous pink-eyed brown . 

 YJU- 2 Bd 2 P 2 X Y 2 Br 2 D 2 p 2 . Expectation, 1 B, 1 Br. 



Cross 82a. Homozygous dilute black crossed with pink-eyed brown, heterozygous in 

 density. Y 2 Br 2 B 2 d 2 P 2 X Y 2 Br 2 Ddp 2 . Expectation, IB, IdB. 



Cross S3. Dilute black heterozygous in dark eye crossed with pink-eyed brown heterozy- 

 gous in density. Y 2 Br 2 B 2 d 2 Pp x Y 2 Br 2 Ddp 2 . Expectation, 1 B, 1 pB, 1 dB, 1 pdB. 



XI. Pink-eyed Black, YBrBDp (Fig. 11). 

 Eyes deep pink; ears very lightly pigmented. Hairs on ventral surface light yellowish-gray. 

 Tail lightly pigmented. Dorsal hairs varying from a very light yellowish slate color to 

 a deep lilac. The tufts of light hairs back of the ears are present. No appearance of 

 black pigment in the dorsal hairs, to the unaided eye. The nose whiskers are light, 

 almost yellow. The whole appearance resembles somewhat the dark-eyed dilute brown, 

 The feet are slightly pigmented and the hairs around the anus are light. 



Pink-eyed black x pink-eyed black. 



Cross 84. Both parents heterozygous in black. Y 2 Br 2 BD 2 p 2 x Y 2 Br 2 BD 2 p 2 . Expectation, 

 3 pB, 1 pBr. 



Pink-eyed black x brown. 



Cross So. Both parents heterozygous in the color factor. YBr 2 B 2 D 2 p 2 x YBr 2 D 2 P 2 . Expec- 

 tation, 3 B, 1 W. 



Mating. 



Parents. 



B. 



356 2178x2175.. 4 



W. 



