342 



Journal of Agricultural Research voi. xxii. no. 



Table III. — Numbers of spelts and wheats produced in the F3 generation from the F^ 

 heterozygous plants, and comparison of these with theoretical expectations, calculated 

 on the J to I basis 



FAMILIES SHOWING THE PRESENCE OF TWO SPELT FACTORS 



Of the crosses studied, two families, 13126a (Giant Squarehead X spelt) and 3019a 

 (spelt X Salt Lake Club) produced a very low proportion of wheat types. Not much 

 importance would have been attached to the irregular behavior of these families if 

 an apparently similar behavior had not been observed in another sativum X spelta 

 cross. The manner of segregation of the progeny of these two crosses is given in 

 Table IV. 



Table IV. — Degree of spelling and proportions of spelts and wheats obtained in the 

 F2 generations of spelta X sativum crosses which did not segregate in the 3 to T ratio 



1 Series 13126a, Giant Squarehead (C. I. No. 3351, selection 13366) X spelt (selection 13437). 

 ' Series 3019a, white spelt X Salt ijake Club. 



