Question: In the 19th century the prevailing theory of inheritance was the BLENDING THEORY. According to this theory of inheritance, crosses between individuals of differing phenotypes would produce F1 progeny with a phenotype midway between those of the parents, the midparent value. Subsequent crosses among progeny would, of course, produce many generations of individuals with the midparent genotype/phenotype. Mendel’s work refuted the blending theory, and the critical observation was.
a. dominance of one phenotype over another, i.e. dominants and recessives.
b. the fact the Pisum sativum true breeding lines were available.
c. the fact that P. sativum has only six chromosome pairs and he studied 7 characters.
d. the fact that the recessive phenotype reappeared in the F2 generation.
e. the fact that the recessive phenotype was not seen in the F1 generation.