60 



p. W. WHITING AND HELEN DEAN KING 



TABLE 1 



Dilute grays 



Dilute blacks or light sepias 



Dilute gray hooded 



Light sepia hooded 



Fawns 



Fawn hooded 



Albinos 



Totals 



A.S.CrCr 

 O.o/j.Cj-Cr 



A or a. 

 A or a. 

 A or a. 



S or Sfi-CaCa 



9 

 3 

 3 

 1 



24 



16 



64 



Professor Castle. Red-eyed yellows along with pink-eyed yel- 

 lows were obtained from England by Castle. Red-eyed yellow 

 crossed with pink-eyed yellow has been shown to produce the 

 black-eyed type, either agouti or black. The factor for red-eye, 

 rr, shows partial coupling in both sexes with' that for pink-eye, 

 pp, according to Castle and Wright ('15). The red-eyed yellow 

 females supplied by Castle were homozygous for self and for 

 agouti. They did not carry pink-eye. When crossed to the 

 new ruby-eyed dilute males they produced in all sixteen litters 

 consisting of eighty-seven individuals, thirty-nine males and 

 forty-eight females, all of the wild gray type. The reconstitu- 

 tion of the wild gray type in Fi shows that the parental types are 

 not determined by factors at homologous loci. The F2 generation 

 consisted of one hundred and one individuals, fifty-two males 

 and forty-nine females. There were fifty-nine of the wild type, 

 twenty-nine males and thirty females; nineteen ruby-eyed dilute 

 grays, ten males and nine females; and twenty-three red-eyed 

 yellows, thirteen males and ten females. On the basis of free 

 interchange of the factor for ruby-eyed dilution with that for 

 red-eyed yellow, we should expect 56.81 black eyes, 18.93 rubies, 

 18.93 reds and 6.31 ruby-reds. Castle ('16) has found indications 

 that both red-eyed yellow and pink-eyed yellow, besides being 



