66 



INHERITANCE OF CHARACTERISTICS IN DOMESTIC FOWL. 



of stability— about grades 1 and 9— and true blending of these grades, 

 giving an intermediate condition, does not occur. Otherwise, in conse- 

 quence of the repeated hybridization, the intermediate grades must be the 

 commonest instead of the rarest. There is alternative inheritance of the 

 nostril height. 



Table 55. — Summary of tables 4S to 54. 



ABSOLUTE FREQUENCIES. 



Table 

 No. 



Nature of mating (parental 

 nostril). 



Nature of 

 mating. 



Grade of openness in offspring. 



10 Total. 



45 

 46 

 47 

 48 

 49 

 50 

 51 

 52 

 53 

 54 



HighXhigh 



HighXlow. 



Heterozygous X low. 



Heterozygous X heterozygous . . 



....Do 



Heterozygous X high 



Do 



Extra highXhigh 



Heterozygous X extracted low. 

 Extra lowXiow 



DXD 



DXR 



DRXR 



DRXDR 



FiCDRXDR). 



DRXD 



DRXDD 



DDXDD 



DRXRR. . . 

 RR X RR 



2 

 13 

 23 

 90 

 117 

 10 

 71 



9 

 40 



8 



2 

 19 



14 



140 



171 



13 



96 



19 



35 



8 



1 



9 



9 



86 



129 



10 



73 



18 



26 



1 



7 



2 

 20 

 54 



5 

 30 

 15 



7 



6 



2 



4 



21 



40 



4 



39 



14 



3 



5 



4 



"is 



11 



1 



24 

 8 

 1 



8 



1 



1 



9 



19 



2 



23 



22 



28 

 1 



13 

 39 

 8 

 95 

 93 



39 



17 



57 



6 



119 



169 



27 



8 

 41 



2 



68 



105 



119 



56 



53 



420 



678 



61 



638 



472 



112 



16 



Totals . 



378 



512 



361 



141 



133 



72 



85 



277 



407 



249 



PERCENTAGES. 



Table 

 No. 



Nature of mating (parental 

 nostril). 



45 

 46 

 47 

 48 

 49 

 50 

 51 

 52 

 53 

 54 



HighXhigh 



HighXlow. 



Heterozygous X low. 



Heterozygous X heterozygous. . 



....Do 



Heterozygous X high 



....Do 



Extracted high X high 



Heterozygous X extracted low 

 Extracted lowXlow 



Nature of 

 mating. 



DXD 



DXR 



DRXR 



DRXDR 



JMDRXDR) 



DRXD 



DRXDD..,. 

 DDXDD.,,. 



DRXRR 



RRXRR 



Grade of openness in offspring. 



1.7 

 23.2 

 43.4 

 21.5 

 17.3 

 16.4 

 11.1 



1.9 

 35.8 

 50.0 



1.7 

 34.0 

 26.4 

 33.3 

 25.2 

 21.3 

 15.1 



4.0 

 31.3 

 50.0 



0.8 

 16.1 

 35.9 

 20.5 

 19.0 

 16.4 

 11.4 



3.8 

 23.2 



0.8 

 12.5 

 3.8 

 4.8 

 8.0 

 8.2 

 4.7 

 3.2 

 6.3 



5.0 

 3.6 

 7.6 

 5.0 

 6.9 

 6.6 

 6.1 

 3.0 

 2.7 



4.2 

 7.1 



"4!3 

 1.6 

 1.6 

 3.8 

 1.7 

 0.9 



6.7 

 1.8 

 1.9 

 2.1 

 2.8 

 3.3 

 3.6 

 4.7 



23.5 

 1.8 



3.1 



5.8 



13.1 



14.9 



19.7 



32.8 



4.1 



8.4 



9.8 



18.7 



35.8 



10 



22.7 



1.2 

 6.1 

 3.3 



10.7 

 22.2 



