FUR AXIMALS 



1391 



KEY TO GENETIC TYPES 



PURE BREEDING 

 PARENTS (Pi) 



HYBRID PROGENY (F, 

 OF PURE BREEDING 

 PARENTS 



RED 



JlABB 



SMOCKY 

 E.ED 



AABb 



5~iv~i;: 



BLACK 



-.-5" is 



BED 

 CEOSS FOX 



^-lafiB 



BLENDED 

 CROSS FOX 



S.3- 



j-iv:-- 



BLACK 



ALASKAN 

 BLACK 



rrr,BB 



SUB- 

 ALASKAN 

 BLACK 



rrrrBt, 



DOUBLE 

 BLACK 



MATINGS 



SECOND GENERATION (F 2 ) 

 OF HYBRID PROGENY 

 BRED INTER SE 



CROSSING F, TO PURE 

 BREEDING P, TYPES 



CROSSING Fi TO OTHER 

 Pi TYPES 



OTHER, POSSIBLE 

 MATINGS 



m m m 



2 3 4 



m m h 



10 



H ffl t±l H 



II 12 i , i ,i , i 13 14 



15 



^rn DDUEI 



l 17 18 urn 19 20 nm 2 ' 22 

 njr" npr ~nT 



D i lM MM 



19 20 



3 



2^ 



25 



26 



27 



( LPump mnrwn pcd^iij wnr^ - * 

 pzHifctj l^mjij u^ rrM FUT llH 



( rniMTi i i firn itil rm ljcli: 



28 29 30 31 32 3 3 3 4 35 



37 



3C 36 rirr rm 37 rm 



illm rf»H rrj* pnj 



38LLLJ 39LMJ 40 □DLL] 4iLJJDt 



42 



43 



44 



1^ 



45 



Figure 6. — Diagram illustrating the genetic types of foxes and the results of various 

 matings on the basis of a two-factor inheritance. Black squares represent matings, 

 and numerals within the squares represent the expected distribution of progeny 



in proportion-. 



