90 R. A. EMERSON 
Al Dilute Dilute 
Color types Purple Sun re Shile  Som res Total 
la Ila IIla IVa 
@bserviedit == wae eee 43 43 35 48 169 
Caleulated=see. = eee 42 42 42 42 168 
Ditterences ee ee eee +] +] —7 +6 +1 
Purple Ia x green IVg.— The cross between purple Ia and green IVg 
should have given results identical with those expected from the cross 
of green-anthered purple with dilute sun red. Tho parents are supposed 
to have been A B Pl?’ and A b pl R’, and the Fi, therefore, A A Bb Fl 
pl R’ 7’. The Fy’s were purple-anthered purples. Two F2 progenies are 
listed in table 38, group 2. All the expected color types occurred, but 
the observed frequency distribution was such as might be expected to 
occur by chance only about once in eleven trials, P equaling 0.09. If 
these progenies are grouped into five classes, anther color being disregarded, 
the fit is somewhat better, P equaling 0.16. The comparison of observed 
and theoretical frequencies follows: 
Plant color Purple Purple Sunred Sunred zee pee Green Total 
Anther color Purple Green Pink Green Purple Pink Green 
Ta Ig Ila Ilg Illa IVa IlIg,1Vg 
Observed eto) eres or. 26 14 17 3 9 2 1 72 
Calculated’ tate ape 31 10 10 3) 10 3 5 72 
Differences wasaceeei ee =i) +4 oil 0 1 1 4 0 
The F» of this cross exhibited, as expected, practically the same results 
as were obtained from the cross of green-anthered purple with dilute 
sun red. Unlike that cross, the one under consideration here was checked 
by the behavior of some of its F2 types in later generations. 
A single F, purple-anthered purple produced in F; 16 plants (table 39, 
group 1), including only purple, sun red, and dilute purple in the relation 
9:4:3. Of both the purples and the sun reds, some plants had colored 
and some had green anthers. Obviously two other types, dilute sun red and 
green, should occur in such an F; and doubtless would have been found 
had a larger number of plants been grown, for the F»2 plant, in order to have 
produced the color types recorded, must have been A A Bb Pl pi R’7’. 
