Talk about the monohybrid cross.

Simplest one, involved in only one pair of contrasting traits. Each experiment is called monohybrid cross, made by true breeding individuals from two parent strains, each exhibiting a different trait under study, we study the first generation firstly and then the second one (selfing) which is the result of self fertilization. Parents are P1, first filial generation is F1 second generation is F2 ...