part a during mendel's lifetime most people believed in the blending theory of inheritance which said that offspring were a blend of their parents traits. mendel's systematic crosses allowed him to replace the blending theory with the particulate theory of inheritance which says that traits are passed on because discrete units of inheritance, we now call genes, are passed on. in the twentieth century the discovery of what type of inheritance initially seems to support the blending theory in the f1 generation of a cross, but then disproves the blending theory and supports mendel's particulate theory in the f2 generation when some individuals exhibit the original parental phenotypes? during mendel's lifetime most people believed in the blending theory of inheritance which said that offspring were a blend of their parents traits. mendel's systematic crosses allowed him to replace the blending theory with the particulate theory of inheritance which says that traits are passed on because discrete units of inheritance, we now call genes, are passed on. in the twentieth century the discovery of what type of inheritance initially seems to support the blending theory in the f1 generation of a cross, but then disproves the blending theory and supports mendel's particulate theory in the f2 generation when some individuals exhibit the original parental phenotypes? the discovery that there can be more than 2 alleles for a gene. the discovery that one gene can produce many different proteins. the discovery of incomplete dominance