70 



THE INHEEITANCE OF COLOR IN MICE. 



Black X pink-eyed brown. 



Cross 74. Black heterozygous in dark eye crossed with homozygous pink-eyed brown, 

 YiBriBiD^Pp X YiBrJ)iPi. Expectation, 1 5, 1 pB. 



Cross 75. Black heterozygous in dark eye and black crossed with homozygous pink-eyed 

 brown. YSriBDJPp x Y^BriDiPi. Expectation, 1 5, 1 pB, 1 Br, 1 pBr. 



Bl<ick X pink-eyed dilute brown. 

 Cross 75a. Both parents homozygous. YiBriBiDtPt x YiBrdiPi. Expectation, all B. 



Cross 75b. Black heterozygous in dark eye, crossed with homozygous pink-eyed dilute 

 brown. YiBrnBiDiPp x YiBr^diPi. Expectation, 1 B,l pB. 



X. Dilute Black, YBrBdP (Fig. 10). 

 Eyes black; ears, tail, and feet moderately pigmented. Ventral hairs slate-colored. Dorsal 

 hairs are deep blue slate, somewhat washed-out, and at times resembling a very deep- 

 colored dilute black agouti. There is a small tuft of light hairs at the base of the ears. 

 Light yellowish hairs scattered on sides and feet, and around the anas. Unlike the 

 pink-eyed black form next to be described, one would not hesitate in calling the dilute 

 black animal, black pigmented. 



Dilute black X dilute black. 

 Cross 76. Both parents homozygous. YiBriBdJPi X YiBr%B^P2. E.xpectation, all dB. 



