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Predicting Parrotlet Color Mutations (Double)

Recessive Mutations Demonstrated Using Punnett's Square
Each Parrotlet donates one set of chromosomes expressed with capital letters to demonstrate dominance. Recessive mutations are expressed with lower case letters. In this example "B" = blue so a normal bird not having any blue genes is expressed as "BB". A blue bird is expressed as "bb". A split bird is expressed as "Bb" denoting one blue gene.

Double Mutations
The following examples are valid for working with any two autosomal recessive mutations. These Punnett Squares will apply to any combination of Blue, American Yellow, Pastel (European Yellow), Lutino, or Fallow Parrotlet.