Trihybrid Cross Calculator

Expected offspring counts for an AaBbCc × AaBbCc cross.

All dominant (27/64) 27

Two dominant each (9/64) 9

One dominant each (3/64) 3

All recessive (1/64) 1

Formula: 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1 out of 64

Step-by-step with your numbers:

1. Values used:

2. Number of offspring = 64

4. All dominant (27/64) = 27

5. Two dominant each (9/64) = 9

6. One dominant each (3/64) = 3

7. All recessive (1/64) = 1

Did we solve your problem today?

A three-gene cross between triple heterozygotes follows a 27:9:9:9:3:3:3:1 ratio out of 64.

The math behind it

Each gene independently gives 3:1, so three genes multiply to the 64-part ratio.

640 offspring → 270 all-dominant, 10 all-recessive.

Why 64?

4 × 4 × 4 — each gene contributes a 4-box Punnett square.