| F1 generation | F2 generation |
| 1) F1 generation or first filial is the offspring of first generation parents. | 1) F2 generation is the offspring of second generation parents. |
| 2) Cross pollination of pure breeds will give F1 generation. | 2) Self or crosspollination of F generation will give F2 generation. |
| 3) All the individuals produced in F1 generation are heterozygous. | 3) Individuals produced in F2 generation may be homozygous or heterozygous. |
| 4) Only the dominant characters are expressed in this generation. | 4) Homozygous recessive plants express recessive characters. |
| 5) All the individuals produced in F1 generation are same, both phenotypically or genotypically. | 5) In F2 generation individuals, the phenotype ratio is 3:1 and the genotype ratio is 1 : 2 : 1. |
