why is the blending hypothesis incorrect?

Answer 1

If you're talking about genetics:

--The blending hypothesis says that the genes for a trait mix together in the offspring.
-- That goes against the rule of unit factors which tells us that the genes for a trait stay separate from each other in the offspring and can be passed to the next generation unchanged.

This is why tall x short can produce tall plants in the F1 generation, but short plants can show up again in the F2. The gene for short did not blend with tall. The gene for short didn't show, but it was still there and was passed on unchanged from the tall F1 individuals.

Answer 2

blending hypothesis is incorrect coz
1) it cant explain inheritance of sex,
2) it cannot explain atavism, i.e. sudden appearance of ancestral characters
3) it cant explain the characters of F2 generation, as in the case above.