MENDEL SELECTED GARDEN PIE PLANT(PISUM SATIVA) FOR HIS EXPERIMENT.HE SELECTED BOTH TALL AND DWARF PLANT ALLOWED THE TOGROW NATURAL.HE OBSERVED TALL PLANT PRODUCE ALWAYS TALL PLANT GENERATION AFTER GENERATION UNDER NATURAL CONDITION
AND DWARF PLANT PRODUCE DWARF PLANTS GENERATION AFTER GENERATION .HENCE HE NAMED BOTH TALL AND DWARF PLANT AS PURE BREEDING VARIETY OR WILD TYPES.THEN HE CROSSED THEM.INT THE FIRST FILAL GENERATION
there was not anymedium height plants or dwarf plants. This means that only one of the parental traits were seen and not the mixture of the two. When such a F1 tall plant was allowed to have self pollination, both the tall and dwarf plants appeared in second filial generation (F2). in the ratio of 3:1. This indicates that both tallness and dwarfness were inherited in the F1 plants but only tallness trait was expressed.
The first experiment of Mendel considering the inheritance of a single trait
(Height of the plant Tall/Dwarf) is called MONO HYBRID CROSS