Practice setting up keys for the phenotypes listed in each set Remember that the medium trait must always be heterozygousBirds can be blue white or white with blue-tipped feathers?

To set up keys for the described bird phenotypes, we can use the following designations: let "B" represent the allele for blue feathers and "b" represent the allele for white feathers. The blue feathered birds can be homozygous (BB) or heterozygous (Bb), while the white feathered birds are homozygous (bb). The medium trait, which is white with blue-tipped feathers, would be represented as heterozygous (Bb), indicating a blend of traits. Thus, the key would classify birds as blue (BB or Bb), medium (Bb), or white (bb).