L06 LOCK : STUDIES IN L'LANT HKKKM No. 



THE EXPERIMENTS. 

 I.__ CROSSES BETWEEN DEFINITE RACES. 

 \. cording to the modern method, the use of which is now well 

 established, these crosses will be dealt with under the heads 

 i i t In separate pairs of characters concerned. Simple pairs of 

 characters will he treated first, the hehaviour of more than one 

 pair being considered later. 



A.— Single Pairs of Characters (Monohybrid Crosses). 



1. — STARCH CORN CR0S8ED WITH SUGAR CORN. 



In the case of crosses of tins kind. Correns and de Vries 

 have shown that there is dominance of the starchy (round) 

 character over the sugary (wrinkled), and that these characters 

 rebate in a regular manner at the formation of the genu 

 cells. The evidence which follows shows that Mendel's law 

 of segregation in equal numbers is usually fulfilled with great 



exactness. 



F 1. 

 The immediate result of Crossing (visible as " xenia ). 

 (a) Sugar Corn x Starch Corn.* — 



The following cases were observed : — 

 Experiment 1. — Black Mexican < 117///' Dent. 

 2. Black Mexican ■ Flint corn.^ 

 :; Black M ' > xican x YeUow />■ nt. 

 4.- Moore's Concord x 117///' /><ni 

 Moore's Concord ■ Flint corn.] 

 <;. Moore's Concord YeUow Dent 



In all the fcheresultwaa practically identical. The 



in produced took on a smooth rounded form. and the consis- 

 tency became mealy or Homy to a degree nearly resembling 

 thai of Hint corn, no maiiei whether the pollinating parent 

 was Hint oi dent. It eer oleai that the particular degree oJ 



• 1 1. i. and elsewhere the seed parent tand in i . the pollen parent 



ond 



Mm flint '"in was a mixed brain i i lour is concerned, 



l, ut then i no reason for upposing thai ii was impure Ln respect oi 

 i he Him ( imool h, round . i ar< '> ) i hai actei 



