Genetics & Punnett Square
Interactive Punnett squares plus Mendelian inheritance reference.
Punnett square
Type each parent's genotype — one letter pair per gene, e.g. Tt or TtRr.
| T | t | |
|---|---|---|
| T | TT | Tt |
| t | Tt | tt |
Genotypic ratio
2 Tt : 1 TT : 1 tt
Tt 50.0% · TT 25.0% · tt 25.0%
Phenotypic ratio
- 3/4 · T dominant
- 1/4 · t recessive