F,. 



F. M. Durham 165 



Golden agouti x chocolate-lilac gives golden agouti F^, 

 GgBhEe x GgBhEe. 



Pink-eyed 

 Golden Cinnamon Pinli-eyed cinnamon Blue Chocolate- 



agouti agouti Black Chocolate agouti agouti lilac lilac Champagne 



Observed 83 8 31 2 26 7 11 4 



Calculated 72-9 24-3 24-3 8-1 24-3 S'l 27 5 '4 2-7 



Golden agouti x pink-eyed agouti gives golden agouti F^. 



Golden agouti Pink-eyed agouti 

 F^. Observed ... 32 17 



Calculated ... 36 ^o 12-25 



Cinnamon agouti mated ivith chocolate-lilac giving cinnamon agouti 



Cinnamon Pink-eyed 



agouti Chocolate Cinnamon agouti Champagne 



F,. Observed ... 14 4 3 1 



Calculated ... 12-3 4-1 4-1 1-4 



Agouti heterozygous in pink-eyed agouti y. pink-eyed agouti. 



Agouti Pink-eyed agouti 

 Observed ... 11 8 



Calculated ... 9-5 9-5 



Agouti heterozygous in pink-eye and chocolate y. pink-eyed agouti 

 heterozygous in chocolate. 



Pink-eyed 

 Cinnamon Pink-eyed cinnamon Blue Chocolate- 



Agouti agouti Black Chocolate agouti agouti lilac lilac Champagne 



Observed 70 2 1 10 001 



Calculated 5-8-5 1-95 1-95 -65 5-85 1-95 "65 1-3 -65 



Agouti heterozygous in pink-eye and chocolate x black ditto. 



Pink-eyed 

 Cinnamon Pink-eyed cinnamon Blue Chocolate- 



Agouti agouti Black Chocolate agouti agouti lilac lilac Champagne 



Pink-eyed agouti y. pink-eyed agouti. From this mating I obtained 



Pink-eyed Pink-eyed Chocolate- 



agouti cinnamon agouti lilac 



37 4 8 



There were no blue lilacs and no champagnes. The explanation of 

 this may be that the pink-eyed agoutis were not all carrying the same 

 characters. 



Another case I cannot explain is the following : 



An albino heterozygous in E was mated with a yellow carrying 

 agouti. From the agoutis F^ of this union I obtained 



17 agouti, 5 black, 1 chocolate-lilac, 1 champagne and 8 albinos. 



