14 



Bulletin 392 



The intensifying gene X also was probably brought into the cross by one of 

 the parents in simplex condition, thus allowing the dark blues to appear in F2. 



Type 2 Tinged white 



Description of the type. — The tinged white type differs from the true 

 white, or albino, in often showing, when the plant is vigorous and growing 

 in strong light, a very faint flush of pink in the solid ground between the 

 rays of the star, the flush becoming deeper on the rays themselves. When 

 conditions are not favorable it appears as a plain white, and might then 

 be easily mistaken for and recorded as that Xy^Q. 



Theoretical consideration of data. — The tinged whites when selfed threw 

 colors as shown in table 4. Plant loo-i-ii-i was recorded once as 

 mauve but was not checked. Plant 108-1-5 was probably like 108-5-1 

 in constitution. The latter has already been discussed among the whites. 

 Plant 109-5-10, recorded as white, was probably a tinged white like its 

 sib 9, which "faded to pale pink." Plant 13 2-2-1, recorded as white 

 and already discussed, was probably a tinged white like its sib 11. Plant 

 159-2, recorded as "tinged white or very light blue," was probably a 

 light blue in constitution but phenotypically a tinged white. 



TABLE 4. Tinged Whites Selfed 



Pedigree no. 



loo-i-ii . 

 I 08-1 -5. . 

 I 08-5-1 . . 

 I 09-5-10. 

 I 32-2-1 . . 

 132-2-11 . 

 109-1 . . . . 

 109-2. . . . 

 109-3... ■ 

 109-5.... 

 159-2. .. . 

 200-2-6. . 



Dark- 

 blue 



Light 

 blue 



Alauve 



Pink 



Tinged 

 white 



I 

 10 



White 



3 



5 

 13 

 7 

 9 

 6 



In pedigree 109 the Fi plants were probably all truh^ tinged whites 

 and of the constitution CCRr. The parents were a pink and a (doubtful) 

 white. Such Fi plants should throw pinks, tinged whites, and whites in 

 the ratio of i : 2 : i when selfed. Altho the number of F2 plants obtained 

 was ver}^ meager (only 34), they are very far from showing agreement 



with this ratio, the colors being as follows: 



Theoretical Observed 



Pink 8.5 4 



Tinged white 17.0 2 



White 8.5 28 



130 



