Flexi Says: Genotypic and phenotypic ratio are not always same in simple trait genetics. The alleles an individual inherits make up the individual’s genotype. The two alleles may be the same or different. This results in three possible genotypes (BB, Bb and bb). The expression of an organism’s genotype produces its phenotype. The phenotype refers to the organism’s characteristics, such as purple or white flowers. Different genotypes may produce the same phenotype. For example, BB and Bb genotypes both produce plants with purple flowers. Therefor genotypic ratio of Bb x Bb is 1:2:1 while phenotypic ratio is 3:1
