Use Monohybrid Punnett when you need to compute offspring genotype probabilities for a monohybrid cross between two parents. Enter Parent A genotype and Parent B genotype using the definitions and units below so the result can be reproduced.

Parent A genotype

A sequence, category, or text value; accepted values are AA, Aa, aa.

Parent B genotype

A sequence, category, or text value; accepted values are AA, Aa, aa.

The published tool contract uses this rule: Compute offspring genotype probabilities for a monohybrid cross between two parents.^[1]

Offspring genotype probabilities

The calculated offspring genotype probabilities.

The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability.

Retain the original Parent A genotype and Parent B genotype values and their units alongside the result. Dihybrid Ratio is useful when you instead need to report the classic 9:3:3:1 phenotypic fractions of an AaBb x AaBb dihybrid cross. HW Chi-Square provides another view by helping you compute a chi-square statistic comparing observed genotype counts against Hardy-Weinberg expectations derived from an allele frequency.

• Dihybrid Ratio

  Report the classic 9:3:3:1 phenotypic fractions of an AaBb x AaBb dihybrid cross.

• HW Chi-Square

  Compute a chi-square statistic comparing observed genotype counts against Hardy-Weinberg expectations derived from an allele frequency.

• FST Fixation Index

  Compute the fixation index fst = (ht - hs) / ht for two populations at a two-allele locus.