In parakeets, two autosomal genes pairs control the production of feather pigmentation. The M allele codes for an enzyme that is required for the synthesis of melanin, which produces the blue pigment and Y allele codes for an enzyme required for the synthesis of yellow pigment. A bird breeder mates two green birds and produces offspring that are green, blue, yellow and white.
1. What are the genotypes of the parents?
2. What are the genotypes of the offspring?
3. In what proportions would you expect to find the offspring?
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