The theory of heredity before Mendel's work was completed can be described as:

a. the theory of chromosomal transmission

b. the theory of blending inheritance

c. the theory of particulate inheritance

d. the theory of natural selection

e. none of the above describes the view of heredity before Mendel's time

b. the theory of blending inheritance

Explanation:

Before Mendel's work was completed and published, theory of blending inheritance was widely accepted. According to it traits from both parents were blended and expressed in the next progeny. The new trait wont be in extreme like its parents' and would fall somewhere in between the spectrum.

Mendel disproved theory of blending inheritance by his famous pea experiment. When he crossed a pure breeding tall and pure breeding dwarf pea plant he got all tall pea plants in next progeny. According to theory of blending inheritance, the height of pea plants in next progeny should have been a result of mixing of heights from the two parent plants. But all the plants were tall like one of the parent plant disapproving the theory.

The correct answer will be option-E.

Explanation:

Gregor Mendel is known for his transmission of traits - the principle of inheritance.

He was the first person to show the idea that how the traits are passed on from generation to the next generation through factors which gave rise to the theory of heredity.

Before him, no other theories wee predicted and proposed to show the inheritance pattern and therefore option-E is the correct answer.