EXPERIMENTS OF MENDEL
When only a single pair of contrasting or differentiating traits is considered in a cross (or inheritance of only one pair of contrasting traits is studied in a cross), it is called monohybrid cross, e.g ;
The two forms of the trait appear in F2 generation in ratio of three dominant to one recessive, 3 : 1. It is also called monohybrid ratio. For example, in the character of height (cross tall X dwarf) Mendel obtained 787 tall and 277 dwarf plants (ratio 2.84 : 1). A similar result for flower colour was 705 red to 224 white (ratio 3.15 : 1).