262 



GENETICS AND EUGENICS 



as Mendelian alternatives in heredity, for in color inheritance 

 different grades of pigmentation, of spotting, etc., frequently 

 behave as Mendelian allelomorphs. So probably different 

 degrees of sexual distinctness behave in heredity, for in the 

 plant. Lychnis, Shull has shown that femaleness is allelo- 

 morphic not only with maleness but also with hermaphro- 

 ditism, the three conditions being triple allelomorphs. A 

 similar interpretation may perhaps be given to conditions 

 found in certain mosses as discussed by Collins. 



