(1) Incorrect — Mendel conducted his experiments for about 7 years (1856–1863), not nine years.

(2) Incorrect — In Mendelian inheritance, there is no blending at F₁; one trait (dominant) expresses itself completely.

(3) Correct — A recessive trait generally results when the allele produces a non-functional enzyme or no enzyme, so the trait is not expressed in presence of a dominant functional allele.

(4) Incorrect — In dominance, F₁ hybrid resembles only one parent (dominant), not both.