PLANT HYBRIDIZATION BEFORE MENDEL 315 



SERIES IV 



If, as Mendel assumed, the egg and pollen cells bore the differ- 

 ent characters of dominant and recessive in equal numbers, then 

 we would expect in each experiment, that the four combinations 

 would be produced in equal numbers. 



It is plain, that in the first and third series all the seeds ap- 

 pear round and yellow. 



In the second and fourth series, one lot would appear round 

 yellow, another round green, another wrinkled yellow, and a 

 fourth wrinkled green. 



The actual experiment bore out the theoretical expectation. 



Appearance 

 No. of seeds of seeds 



Series i yielded 98 round yellow 

 Series 2 yielded 31 round yellow 



26 round green ■ 



27 wrinkled yellow 



26 wrinkled green 

 Series 3 yielded 94 round yellow 

 Series 4 yielded 24 round yellow 



25 round green 



22 wrinkled yellow 



27 wrinkled green 



It is clear thus far, as to the outcome in series 2 and 4. In 

 both cases, the four different possible, combinations were produced 

 in equal numbers. It now remained to determine the actual com- 

 position of the 98 and 94 seeds in the firsthand third series, re- 

 spectively. All of the seeds of each of these two series were sown. 

 From the 98 seeds of Series I, 90 plants resulted, and from the 

 94 seeds of the second series, came 87 plants. 



These all yielded as follows : 



