E XTEN DE D SE RIE S . 



G7 



IX. Black, YBrBDP (Fig. 9). 



Hairs on ventral surface not so heavily pigmented as the dorsal hairs, and of a dull slaty 

 black. Tail dark. Dorsal hairs deep, glossy black. Tuft of yellowish hairs at base of 

 ears. A few yellowish hairs scattered along the flanks, sides and feet. The hairs 

 around the anus are light yellowish. The feet are dark. 



Black x black. 



Cross 62. One or both of the parents homozygous. Y 2 Br 2 B 2 D 2 P 2 x Y 2 Br 2 B 2 D 2 P 2 . Expec- 

 tation, all B. 



Cross 63. Both parents heterozygous in black. Y 2 Br 2 BD 2 P 2 x YiBrtBD.P*. Expecta- 

 tion, 3B, 1 Br. 



Mating. Parents. \ B. Br 





1x400.. 6 2 



Cross 64. Both parents heterozygous in density. YoBriBtDdP: x Y 2 BrzB 2 DdP 2 . Expec- 

 tation, 3 B, 1 dB. 



Matins. Parents. ( B. dB. 



o/ / 



7214x7217... 3 3 



Cross 65. Both parents heterozygous in dark eye. Y 2 Br 2 B 2 D 2 Pp x YiBnBiDiPp. Expec- 

 tation, 3 B, 1 pB. 



Mating. 



Parents. 



B. pi:. 



492 

 168 

 189 

 114 

 131 

 13.3 

 379 





Unmarked x 2948 3 



455x919 12 



450x540 6 



Unmarked x 454 12 



543x444 2 



450 x 444 7 



Unmarked x unmarked ... 60 



102 



1 



I 



■i 



1 



1 



1 



20 



30 



