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Predicting Parrotlet Color Mutations (Single)

Recessive Mutations Demonstrated Using Punnett's Square
Each bird 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 Parrotlet is expressed as "Bb" denoting one blue gene.

Single Mutations
Although the blue mutation has been used in these examples, these Punnett Squares will apply to Blue, American Yellow, Pastel (European Yellow), Lutino, or Fallow Parrotlets.