Heredity Studies in the Morning-Glory 



29 



vidual, which showed inconspicuous white flecks on a soHd magenta 

 ground. 



Taking the progeny of the two heterozygous parents together, 7 were 

 flaked and 5 were not flaked. There were 9 unflaked plants altogether 

 in the Fi generation; 5 of these were selfed, and gave a progeny of 133 

 unflaked plants and i that was recorded as flaked. 



Further data in which flaked plants were used as parents in crosses 

 have since been obtained and are given in tables 6, 7, and 8; the last- 

 named table was made from data of J. J. Pollock's cultures. It should 

 be noted that in all cases except cross 195 (and no cross into which a 

 flaked plant entered has been omitted) the flaking character appears in 

 the Fi progeny. Some unflaked plants also appear among these Fi prog- 

 eny, but their presence is easily explained in that one of the parents 

 may have been simplex for the gene. 



All evidence, then, from the Fi progenies of crosses into which the gene 

 for flaking entered, points to the fact that this gene is a dominant one, 

 and that whenever present in one of the parents in duplex condition the 

 character will be manifest in all the Fi plants; if it is simplex in one of 

 the parents, unflaked plants also can appear in the Fi progeny. 



TABLE 6. 



Types Resulting from Crosses Between Flaked Whites and Solid- 

 Colored Plants 



10 



145 



