◆Mendel showed that the traits can either be dominant or recessive through his experiments they  focused on mono-hybrid cross. 

◆The experiment involved crossing tall (TT) pea plants with dwarf (tt) pea plants. 

◆The resultant plants which formed after fertilization represented the F1 generation.

◆All the F1 plants were tall.

◆After that Mendel proceeded to self-pollinate the F 1 generation plants and the result was 1/4th of the plants obtained in the F2 generation were dwarfs.

◆  Mendel concluded that the F1 tall plants were not true-breeding, but they carried the traits for both tall and dwarf heights. 

◆A portion of the plants were tall due to that the traits for tallness were dominant over the traits for dwarfness. 

◆This cements the notion that traits can either be dominant or recessive .