542 



DWARFS IN GLUYAS EARLY (WHEAT) HYBRIDS. 



For the further discussion io6 selections from the F.2 genera- 

 tion of 36a X 41A (Rieti X Gkiyas Early) have been chosen." 



Out of this 106, 42 gave dwarf forms in their progeny, i.e., 

 on the F.3 generation from apparently normal parents. 



The total numbers of individuals from these 42 selections = 

 4,124, out of which the number of dwarfs = 948 — i.e.. for true 

 recessive theoretically there would be 4 : i, i.e., 4,124 : 1,031 ; 

 giving thus a theoretical number of recessives of 1,031 as com- 

 pared to the actual count of 948, in which the theoretical with 

 the actual number compares as 25 per cent. : 22.99 P^^' cent., a 

 close enough relation to establish the fact that dwarfness is a 



4< 



■V \ N. 



Fig. 2. — Frequencj' Curve for Length of Ear (cm.). 36(7 X 41--^. 



true recessive characteristic. It may be noted that even this actual 

 number of dwarfs counted shows a less number than actually 

 grew, as, in the cultivation of these rows, the unskilled labour 

 used may have been responsible for removing some of the dwarfs, 

 as these in the earlier stages of growth are very grass-like, and 

 consequently may be removed. 



There are a number of instances where the actual number 

 for the recessive very nearly approaches the theoretical number, 

 e.g., in selections i, 30, 46, 66, etc., there are respectively 24: 77; 

 46 : 131 ; 15 : 43 ; 24 : 70. dwarf : tall. 



In another series of hybrid progeny Florence X Gluvas Farlv 

 i.e., ^yh X 41'? (for ^yh see Table I, c) — from 41 selections of 



