F. C. Miles 



201 



TABLE II. 



Thu zygotic formulae and colour of plants in the progeny of F^ plants hetero- 

 zygous for both factors, together with the expected behaviour in F.^. 



Fo plants 



Zygotic 

 Number formulae 



A ABB 



AABb 



AaBB 



AaBb 



AAbb 



Aabb 



aaBB 



aaBb 



aabb 



Colour Expected behaviour in F,i 



Green Should breed true 



Greeu Should throw 3 greeu, 1 pure white 



Green Should throw 3 green, 1 yellowish-white 



Green Should throw 9 green, 3 yellowish-white, 4 pure white 



P.ure white Fa plants would die iu seeding stage 



Pure white F2 plants would die in seedling stage 



Yellowish-white Survivors (by becoming green) should breed true 



Yellowish-white Survivors (by becoming green) should breed true 



Pure white F2 plants would die in seedling stage 



TABLE III. 



Results obtained in F„ of the cross between heterozygous green plamts of the 

 category in which pure luhite plants occur and heterozygous green plants of 

 the category iw ivhich yelloivish-white plants occur. Hypothetical formulae 

 of the respective F^ plants shoitm at tike left. 



Hypotlietical formulae 



of tlie Pedigree , 



respective Fi plants Number Green 



AABB 3402 69 



3405 6 



Number of Plants 



Yellowish-white 



Striped 1 



Totals 



132 



36 



56 



1 Previous tests have shown that similarly occurring striped plants were merely hetero- 

 zygous green plants, and no doubt the striped plants listed in this column should be 

 included with the green plants. 



