Contructing Punnett Squares
Steps in setting up a punnett square
1. Determine the genotypes (letters) of the parents.
Bb x Bb
2. Set up the punnet square with one parent on each side.
3. Fill out the Punnet square middle
4. Analyze the number of offspring of each type.
How to set up a punnet square
GenotypeDD Dd dd |
Homozygous or Heterozygous Homozygous
Heterozygous Homozygous |
PhenotypeChin cleft Chin cleft No Chin cleft |
Dominant or RecessiveDominant Dominant Recessive |