68 



THE INHERITANCE OF COLOR IN MICE. 



Cross 66. Both parents heterozygous in dark eye and black. Y 2 Br2BD 2 Pp x Y 2 Br 2 BD 2 Pp. 

 Expectation, 9 B, 3 pB, 3 Br, 1 pBr. 



Mating. 



361 



376a 



3766 



247 



318 



316 



267 



364 



303 



295 ' 



349 



334 



358 



333 



444 



336 



447 



Parents. 



/>'. pB. Br 



2596x2593 2 



Unmarked x unmarked. . . 78 



Unmarked X unmarked. . . 13 



1706 X 541 2 



2031x1942 8 



1948x1950 5 



1948x1949-1950 3 



20S4X20S6 2 



2084-2085x2086 11 



2186-87-88-89x2184 31 



2212x2213 7 



2218 x 2213 6 



2210x2219 4 



2210-14x2219 15 



2216x2219 : 4 



Unmarked x 2593 7 



2945 x unmarked 1 



199 



1 

 26 

 7 

 1 

 2 

 4 



3 



16 



4 



5 



*2 



2 

 1 

 1 



75 



23 

 5 



'4 

 2 

 1 

 2 

 3 

 6 

 2 

 2 

 1 

 6 



3 

 1 



61 



pBr. 



5 

 2 

 1 



1 



4 



1 

 3 



19 



p? 



Cross 66a. Both parents heterozygous in black, dark eye, and density. Y 2 Br 2 BDdPp. 

 Expectation, 27 B, 9 dB, 9 pB, 9 Br, 3 pBr, 3 dBr, 3 pdB, 1 pdBr. 



Cross 66b. Both parents heterozygous in color factor, black, dark eye, and density. 

 YBr 2 BDdPp. Expectation, 81 B, 27 dB, 27 pB, 27 Br, 9 pBr, 9 dBr, 9 pdB, 3 pdBr, 

 64 W. 



Black x dilute black. 

 Cross 67. Both parents homozygous, Y 2 Br 2 B 2 D 2 P 2 x Y 2 Br 2 B 2 d 2 P 2 . Expectation, all B. 



