GENETIC TYPE AND THE ENDOCRINES 



89 



PLATE 17 



Test mating to determine whether the heterozygous (si) condition for leg achondroplasia 

 gives a morphological expression of this distortion differing to a clearly distinguishable 

 degree from the expression resulting from the homozygous (ss) condition. Bassethound- 

 Saluki hybrids. 



1 Backcross bassethound-Saluki-bassethound hybrids 860 $ (diagnosed as si) and 858 <$ 

 (diagnosed as ss). 



2 Hybrids produced by mating 860$ and 858 <? (from litter 1398-1402). Since no long 

 (11) offspring were produced, the diagnoses for achondroplasia in the parents are proved 

 correct. 



