540 



THE AMERICAN NATURALIST [Vol. L 



TABLE IIIc 



Ceoss of Green x Recessive Yellow (F a Generation)* 



(P2 1-1 5-1 X P30-A-2)-l 



(P21-15-1 X P30-A-2)-2 



(P30-5^ X P38-20-l)-lP 



(P30-5^: X P38-20-l)-2P 



(P30-5^ X P38-20-1)-! 



(P35-1 X P30-3)-l 



(P35-1 X P30-3)-2 



(P35-9-1 X P30-5-4)-l 



(P35-9-1 X P30-5-4)-2 



(P35-9-1 X P30-5-4)-3 



(P35-10-2 X P30-5-6)-l 



(P35-10-2 X P30-5-6)-2 



(P35-10-2 X P30-5-6)-3 



Total actually obtained, 326. 



Total theoretically expected . 



Ratio 



The variety " Goldkonig ' ' breeds true to yellow coty- 

 ledons and wrinkledness. When crossed with varieties 

 breeding true to green cotyledons, the F t generation was 

 invariably green. In most of the crosses, the seed parent 

 was the green variety, but reciprocals have been obtained 

 in two cases. 



The crosses were : 



Goldkonig X Acacia and reciprocal 

 Goldkonig X Market Split Pea and reciprocal 



have always shown cotyledon color in peas to be inherited independently 

 of roundness and wrinkledness of cotyledons. The data given in Tables 

 III b and III c give reason to believe there is linkage or partial coupling 

 involved. Round yellow X wrinkled yellow (Goldkonig) gives practically 



green. All four classes appeared in only one cross, where a single 

 wrinkled green was obtained. Round green X wrinkled yellow (Gold- 

 konig) gave all the expected classes except round yellow, which was absent 



(Goldkonig) X wrinkled green and g reciprocal gave wrinkled yellows and 

 wrinkled greens approximating the expected ratio. 



•The cotyledon colors of the peas concerned in Tatles Illb and IIIc 

 were for the most part independently determined by two separate people, 



very few cases. For help in these determinations, I am indebted to Mr. 

 Montague Free of the Brooklyn Botanic Garden staff. 



