Genetics Calculator

Free online genetics calculator. Punnett square, allele frequency. Perfect for students, teachers, and researchers.

Punnett Square (2×2)

AA
Aa
Aa
aa

Genotype Ratios

AA1/4 (25.0%)
Aa2/4 (50.0%)
aa1/4 (25.0%)

Phenotype Ratios

A-3/4 (75.0%)
aa1/4 (25.0%)

Probability of each outcome:

P(AA) = 1/4 = 25.0%
P(Aa) = 2/4 = 50.0%
P(aa) = 1/4 = 25.0%

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Frequently Asked Questions about Genetics Calculator