Duck: Fur Sheep Crosses 



67 



A SIX HORNED KARACHIEV RAM 



The rams of this strain normally have four horns, the ewes two. His parents were normal 

 Karachiev sheep, and all his offspring by ewes of this breed have had the usual complement of 

 horns. When bred to Lincoln ewes all of his lambs were without horns, so that the genetic 

 factor producing extra horns seems to be entirely lacking in dominance. (Fig. 10.) 



3 to 1 of Table II and Table IV must 

 be considered in the final analysis. 



The average ratio of Tables IV and 

 VI must be considered when figuring 

 the average total theoretical possibili- 

 ties, and checking same with obtained 

 results. The average of these two 

 tables based on their 3 to 1 ratio gives 

 results as shown in Table V. 



The average brings the theoretical 

 possibilities still closer to the obtained 

 results and further strengthens the 

 assumption that the heterozygotic form 

 of Pultava, with respect to color factors 

 was (BbRr). It is assumed that reds 



and spotted had the same heterozygotic 

 form in their germ cells, with respect to 

 color factors. With the exception of 

 two lambs which were of black mosaic 

 pattern the spotted lambs showed a 

 predominance of red pattern. The 

 black mosaics must have been of the 

 form (Bbrr), although the forming of a 

 mixed phenotype of this combination is 

 apparently of infrequent occurrence. 



The zygotic relationship of these 

 color factors and their respective ab- 

 sence is very significant from a practical 

 standpoint, due to the character of the 

 various skins produced. Even though 



