84 CHARLES E. STOCKARD 



only mild indications of the single factor for chondrodystrophy 

 present in their genotype. The result of this mating- is in 

 exact accord with expectation on the basis of a single domi- 

 nant gene for the expression of achondroplasia. This result 

 is also in line with the probability that the Saluki type of 

 bone is inherited as a dominant condition over that of the 

 bassethonnd. All four animals have long, slender heads and 

 thin bodies on the exact pattern of their Saluki grandmother 

 and great-grandfather. 



The F r bassethound-Saluki backcrossed tcitli the basset- 

 hound. The same male F x , 506 $ , used in the previous back- 

 cross mating was now mated to the pure bassethound bitch 

 216 9 (tig. 1, pi. 14). From this mating six puppies, three 

 males and three females, were whelped, five of which lived 

 to maturity. These five backcross bassethounds are shown 

 in plate 16. The expectation for leg length from this back- 

 cross wonld be equal numbers of double short, ss, and inter- 

 mediate, si, and the plate shows three dogs with intermediate 

 legs at the left and two with double short at the right, in 

 accord with this expectation. Although these dogs have one 

 pure bassethound parent and one half-bassethonnd hybrid 

 parent, half of them still show certain dominant features of 

 the Salnki, as would be expected. For example, on careful 

 examination of plate 16, the reader will find that three of 

 the dogs, the first, third and fifth, have the characteristic 

 almond eye of the Salnki. 



PLATE 15 



EXPLANATION OF FIGURES 



Results of a mating between two members of the litter of backcross Saluki- 

 bassethound-Saluki hybrids shown in plate 14 to further follow the expression 

 of bone type and leg length. 



1 Backcross Saluki 1012 <?. 



2 Backcross Saluki 1016 $. 



3-4 Hybrids produced from a mating between 1012 £ and 1010 $. 



3 (LtoR) 1385$ and 1384$. 



4 (LtoR) 1384$, 1383J, 1385$, 1382$. 



