Punnet Squares for: Monohybrid Crosses 1 st Generation 2 nd Generation All Tt or Tt All Tall 1 TT : 2 Tt : 1 tt or ½ TT: Tt : ½ tt 3 Tall : 1 Dwarf Genotypic ratio Phenotypic ratio T T t Tt ¼ Tt ¼ t Tt ¼ Tt ¼ T t T TT ¼ Tt ¼ t Tt ¼ tt ¼
Consider two traits
W = straight brow, w = widows peak
D = detatched earlobes, d = attached
If we cross 2 people who are heterozygous for both traits, how would the punnet square look and what would be the phenotypic ratios?
NOTE: Genotypic / phenotypic ratios can be represented as fractions, decimals, ratios or percentages