68 



THE INHERITANCE OF COLOR IN MICE. 



Cross 66. Both parents heterozygous in dark eye and black. YiBriBDiPp x Y-BriBD^Pp. 

 Expectation, 9 5, 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. 



2596x2593 



Unmarked x immarked. 

 Unmarked x unmarked. 



1706 X 541 



2031 X1942 



1948x1950 



1948x1949-1950 



2084x2086 



2084-2085x2086 



2186-87-88-89x2184... 



2212x2213 



2218 X 2213 



2210x2219 



2210-14x2219 



2216x2219 



Unmarked X 2593 



2945 X unmarked 



B. 



2 



78 



13 



2 



8 



5 



3 



2 



11 



31 



7 



6 



4 



15 



4 



7 



1 



VB. 



199 



1 

 26 



7 

 1 

 2 

 4 



3 

 16 



4 

 5 



2 

 2 

 1 

 1 



Br. 



23 

 5 



i 

 2 

 1 

 2 

 3 

 6 

 2 

 2 

 1 

 6 



3 

 1 



75 



61 



TpBr. 



5 



2 

 1 



1 

 4 



1 

 3 



V? 



19 



Cross 66a. Both parents heterozygous in black, dark eye, and density. YiBr2BDdPj). 

 Expectation, 27 B, 9 dB, 9 p5, 9 Br, 3 pBr, 3 dBr, 3 pdB, 1 -pdBr. 



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

 YBr^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, Y2BriBtD2Pi X YiBriBid^Pi. Expectation, all B. 



Mating. Parents. 



552 



4865x5789.. 



B. 



