MENDELIAN INHERITANCE IN OENOTHERA PRATINCOLA 



37 



TABLE 23 

 Analysis of the FI generation of the cross f. typica M (heterozygous] X /. typica E (a'pFf X cfifi). 



The pistillate parent belonged to the F 2 generation of the cross mut. formosa X mut. lati- 

 folia C. In each of the cultures flat-leaved and revolute-leaved plants occur in about equal 

 numbers. The expected ratio is 1:1. When the germination is poor, the number of revolute- 

 leaved plants often slightly exceeds the expectation, as it does here. Of the 112 plants grown 

 to maturity, taken in part from each of the four cultures, 56 were f. typica, 4 were of other 

 flat-leaved types (1 was mut. fallax and 3 were of a dwarf type), 51 were mut. formosa, and 1 

 was mut. revoluta, which is one of the revolute-leaved mutations thrown by mut. formosa. 



TABLE 24 



Analysis of the F% generation resulting from self-pollination of f. typica plants chosen at ran- 

 dom from the FI generation (see table 23) of the cross f. typica M (heterozygous) X /. typica E 

 aft/). 



Each of the cultures contains both flat-leaved and revolute-leaved plants in approximately a 

 3 : 1 ratio. Of the 49 plants from one culture grown to maturity, 34 proved to be f . typica and 

 15 proved to be mut. formosa. 



GENETICS 6 : Ja 1921 



