Punnett Square 2×2
Calculate Punnett Square 2×2 instantly with the exact formula and a worked example.
Punnett Square 2×2
Parent 1: A alleles (0 = aa, 1 = Aa, 2 = AA)
Parent 2: A alleles (0 = aa, 1 = Aa, 2 = AA)
Probability of dominant phenotype
75%
AA
25%
Aa
50%
aa
25%
Punnett square cells AA : Aa : aa
1 : 2 : 1
More about: Punnett Square 2×2
What it calculates
The “Punnett Square 2×2” calculator computes Probability of dominant phenotype in % from 2 parameters: parent 1: a alleles (0 = aa, 1 = aa, 2 = aa), parent 2: a alleles (0 = aa, 1 = aa, 2 = aa).
A lab calculation in biology and molecular biology.
Example calculation
With parameters Parent 1: A alleles (0 = aa, 1 = Aa, 2 = AA) = 1, Parent 2: A alleles (0 = aa, 1 = Aa, 2 = AA) = 1 the result is 75 %.
How to use
- Enter parent 1: a alleles (0 = aa, 1 = aa, 2 = aa) and parent 2: a alleles (0 = aa, 1 = aa, 2 = aa) — each field above is adjustable with a slider.
- Probability of dominant phenotype (%) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Punnett Square 2×2 calculated?
The Punnett Square 2×2 calculator computes Probability of dominant phenotype (in %) from parent 1: a alleles (0 = aa, 1 = aa, 2 = aa), parent 2: a alleles (0 = aa, 1 = aa, 2 = aa). Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Punnett Square 2×2 calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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