Heredity vStudies in the Morning-Glory 



31 



TABLE 8. 



Progenies from Mr. Pollock's Crosses in Which Flaked Plants 

 Had Been Used as Parents 



It may be asserted, then, from the evidence afforded by the above data, 

 that the character of flaking is a dominant mendeHan character; that 

 when a plant manifests the character, it may be either homozygous for 

 the gene and transmit it to all its progeny, or heterozygous for the gene 

 and transmit it to only a portion (theoretically three-fourths) of its 

 progeny; that when the character is not manifest, the gene for it is lacking 

 and it is incapable of transmitting the character to its offspring. 



GENETICS OF COLOR TYPES INVOLVED IN FLAKING 



It remains now to inquire into the nature of the genes that cause this 

 particular character. 



The pedigree cultures involving this character show that there are 

 white types with colored flakes as well as solid-colored types that are 

 flaked. Indeed, the original material in these studies was of the flaked 

 white type. When crossed with solid-colored types the resultant Fi 

 plants are in most cases solid-colored and flaked. In some cases the 



147 



