116 Inheritance in the Cowpea 



TheF,. 



The results of the F.^ will be found in Table XVII. It will be seen 

 that : 



1. Brown either breeds true (18 families), segregates into brown 

 and maroon (15 families), segregates into brown and red (7 families), or 

 segregates into brown, maroon and red (15 families). 



2. Maroon either breeds true (6 families), or segregates into maroon 

 and red (11 families). 



3. Red breeds true (12 families). 



So far the results appear to confirm the hypothesis which has been 

 put forward. It remains now to examine the proportions in which the 

 various types occur in the segregating families, and also to see if the 

 number of families following the above types of behaviour is in con- 

 formity with the hypothesis. 



The families which segregate into brown and maroon should do so 

 in the 3—1 ratio. The ratio obtained 348 : 107 (3*3 : 1*0) is fairly close 

 to expectation. The 3 — 1 ratio should also be obtained in families 

 segregating into brown and red. The actual numbers recorded were 

 18 red and 65 brown, giving a ratio of 2*9 : 1'O, which is again close to 

 expectation. The proportion of brown, maroon and red in families 

 splitting into all three types should be in the ratio 12:3:1. The sum- 

 marized results are placed below. 



Brown Maroon Red 



Obtained 474 llfi 63 



Expected 489 '7 122-4 40-8 



Here the results again appear to confirm the hypothesis though the 

 number of reds is somewhat above expectation. 



The 3 — 1 ratio is expected in families which segregate into maroon 

 and red. The numbers obtained were 281 maroon and 119 red, a ratio 

 of 24 to 10. This deviation from the 3 — 1 ratio is perhaps due to 

 fluctuation. 



