ok heredity in babbits. 287 



Table 2. 

 Hybrid Shorts bred together (F^). 



Matings. Short. Angora. 



H 5 X H 12 5 2 



H 5 X H 10 1 1 



H 7 X H 10 2 1 



H 7 X H 10 2 1 



H7XH10 4 1 



H 8 X H 10 1 1 



H 8 X H 10 1 1 



H9 xHlO 7 1 



H9xH10 5 2 



H9 xHlO 2 1 



H9xH10 4 



H9xH10 6 1 



H 11 X H 12 5 2 



H 11 X H 12 6 2 



H 12 X H 10 2 



Total 53 17 



The short-coated hybrids of the first generation mated back 

 with the original Angoras produced a mixture of shorts and 

 Angoras in Mendelian proportions. 5 short-coated hybrids 

 mated with Angoras produced 5i young, of which 38 were reared; 

 of these, 20 had short coats similar in appearance to those of the 

 pure and hybrid shorts, while 18 were Angoras indistinguishable 

 from the pure Angoras. The Mendelian expectation for this 

 mating is 19 shorts and 19 Angoras. 



Curiously enough, in the first litter H 8 x A 2 produced 

 5 young, all Angoras, while in the second litter there were 

 3 shorts and 3 Angoras, as expected. The following table 

 gives the numbers obtained in each litter from the individual 

 matings : — 



Table 3. 

 Hybrid Shorts x Angoras (F). 

 Matings. Shoii. Angora. 



H5 X A2 3 2 



H5xA2 5 2 



H7 X A2 4 3 



H8 X A2 5 



H8 X A2 3 3 



ASxHlO 3 3 



A3 X H12 2 



Total 20 18 



