When solving genetics problems, it pays to know what patterns to look for. The parent genotypes and offspring phenotypic ratios in this table can help you figure out what kind of inheritance is at work.
| Parent Genotypes | Offspring Phenotypic Ratio | Type of Inheritance |
|---|---|---|
| Aa x Aa | 3 A_ : 1 aa | Simple dominance, monohybrid cross |
| Aa x Aa | 1 AA : 2 Aa : 1 aa | Incomplete dominance |
| AaBb x AaBb | 9 A_B_ : 3 A_bb : 3 aaB_ : 1 aabb | Dihybrid cross |
| AaBb x AaBb | 9 A_B_ : 3 A_bb : 4 aaB_ : aabb | Recessive epistasis |
| AaBb x AaBb | 12 A_B_ : A_bb : 3 aaBb : 1 aabb | Dominant epistasis |
