SuperCalX

Dihybrid Cross Calculator

Generate a Punnett square for a dihybrid cross (two traits).
Calculator
Enter your values
Results
ABAbaBab
ABAABBAABbAaBBAaBb
AbAABbAAbbAaBbAabb
aBAaBBAaBbaaBBaaBb
abAaBbAabbaaBbaabb

Phenotype Ratios

  • Dom A, Dom B:9/16 (56.3%)
  • Dom A, Rec B:3/16 (18.8%)
  • Rec A, Dom B:3/16 (18.8%)
  • Rec A, Rec B:1/16 (6.3%)
Dihybrid Cross Analysis
Two-trait inheritance patterns

Independent Assortment

This cross demonstrates Mendel's law of independent assortment. The two traits segregate independently, producing 16 possible offspring combinations.

Classic Ratio

For AaBb x AaBb, the expected phenotypic ratio is 9:3:3:1 (9 dominant-dominant, 3 dominant-recessive, 3 recessive-dominant, 1 recessive-recessive).

Applications

Dihybrid crosses are fundamental in genetics for predicting offspring traits in breeding programs and understanding genetic linkage.

How to Use

Step-by-step instructions
  1. 1Enter the 4-letter genotype for Parent 1 (e.g., AaBb).
  2. 2Enter the 4-letter genotype for Parent 2.
  3. 3View the 4x4 Punnett square and phenotype ratios.

Mendelian Inheritance

A dihybrid cross tracks two traits simultaneously. For heterozygous parents (AaBb x AaBb), the classic ratio is 9 dominant-dominant : 3 dominant-recessive : 3 recessive-dominant : 1 recessive-recessive.
9:3:3:1 Phenotypic Ratio

Variables:

A/aFirst trait alleles
B/bSecond trait alleles

Example

AaBb x AaBb

Inputs:

Parent 1:AaBb
Parent 2:AaBb

Steps:

  1. 1.Gametes: AB, Ab, aB, ab (each parent)
  2. 2.16 offspring combinations
  3. 3.Classic 9:3:3:1 ratio expected
Result:
9:3:3:1 Phenotypic Ratio

Frequently Asked Questions

What is independent assortment?

Mendel's law stating that alleles for different traits are distributed to gametes independently of one another.