274 University of California Publications in Agricultural Sciences [Vol.2 



TABLE 16 



Showing Seedling Segregation in the Progeny of Green Plants Indicating 



Complementary Recessive Genes for Golden Yellow and 



Duplicate Genes for Chlorophyll 



VIRESCENT YELLOW (v) 



A third type of seedling called virescent yellow has a small amount 

 of green color in addition to the yellow. These seedlings, like the 

 yellow ones, may produce two types of mature plants, namely, pure 

 green plants and green plants with pale green younger leaves at the 

 center of the rosette. The data at present indicate that virescent 

 plants are produced when a gene dominant to yellow but recessive to 

 green is present Avith the gene for yellow, which changes yelloAv seed- 

 lings to virescent and yellow-center rosettes to pale green centers. 

 When virescent plants are selfed, then green, virescent, and yellow are 

 obtained, but no virescent plants have appeared in the progeny of 

 yellow plants. 



It is hoped that in another place it will be possible to publish 

 more extensive data and a complete discussion of the inheritance of 

 chlorophyll deficient characters in Crepis which cannot be given at 

 this time. 



