46 R. A. EMERSON 
When brown plants of all the genotypes expected in F»2 of the crosses 
of purple x green or dilute sun red x brown are crossed with homozygous 
dilute sun red plants, the following behavior is expected in the next 
generation: 
F, x AA bbplpl 
F, genotypes Dilute Dilute 
Purple Sun red purple sun red 
Ta Ila Illa IVa 
NOS OTS ES SEU SAU cs 8 hy Pape Pacem pS RS Iss etre ae Beare S|? eae 
2 NON BEE E Deore SAS te a ea ee 1 1 eres i ae Cea 
PAE OA UNA A hed el tree Bien aces Baker) I ee 1 ee ee es PeeRee a 
AS COE BRO Pe U Dies ticiek vac ae ee eee eee 1 1 1 1 
A few such tests of F2 brown plants are recorded in table 14. Two plants 
(group 1), on being crossed with dilute sun reds, gave purples and sun 
reds only, 38 of the former to 45 of the latter, where equality was expected, 
the deviation being 3.5 + 3.1. One of these plants has progeny from self- 
pollination listed in table 13, in group 2, the 3:1 lot. This plant was 
expected, of course, to throw only two color types from the cross with 
dilute sun reds, for otherwise it should not have given a 3:1 progeny on 
being selfed. The two brown plants in group 1 of table 14 must have 
beenaaBB Pipl. Two other F2 brown plants (group 2) gave 32 purple 
and 38 dilute purple instead of the equal numbers expected, the deviation 
being 3.0 + 2.8. These plants are assumed to have been aaBb Pl Pl. 
A single F, brown plant (group 3) when crossed with dilute sun red gave 
15 purple plants, and is therefore assumed to have been aa BB Pl Pl. 
The behavior of several F; brown plants when crossed with dilute sun 
reds is also shown in table 14. Three of these plants were from 9:7 F; 
lots and therefore are presumably comparable with Fs browns. One of 
these three (group 4) gave the four color types I to IV in the numbers 
1:2:6:3. It was probably aa Bb Plpl and should have given a 9:7 
progeny if it had been selfed. The other two F3; browns of the 9:7 lot 
gave 49 purple plants (group 7) and are consequently regarded as 
aaBBPlPli. All the other F; brown plants tested were from the 
