Problem 4.19 K)8of9 Enzyme A Feather color in parakeets is produced by the blend

Question

Problem 4.19 K)8of9 Enzyme A Feather color in parakeets is produced by the blending of pigments produced from two biosynthetic pathways shown below. Four independent assorting genes (A, B, C, and D) produce enzymes that catalyze separate steps of the pathways. For the questions below, use an uppercase letter to indicate a dominant allele producing full enzymatic activity and a lowercase letter to indicate a recessive allele producing no functional enzyme. Feather colors produced by mixing pigments are green yellow + blue) and purple (red+ blue). Red, yellow, and blue feathers result from production of one colored pigment, and Pathway : Compound I Enzyme B Compound ICompound III (colorless) (red) (yellow) Enzyme C Enzyme D Pathway II: Compound XCompound Y Compound Z (blue) (colorless) white resuits from absence of pigment production. Part A What is the genotype of a pure-breeding green parakeet strain? Express your answer as combination of allellc symbols. Example: AaBBecDd Submit Request Answer Part B What is the genotype of a yellow strain of

Explanation / Answer

Answer:

PartA:

AABBCCDD

Explanation:

Genotype AA produces red and BB converts red into yellow. Genotype CC produces colorless and DD converts colorless into blue. So the yellow and blue become green.

Part B:

AABBCCdd

AABBccDD

AABBccdd

Explanation:

Genotype, AABB produces yellow. Genotypes CCdd or ccDD or ccdd produces white. So white and yellow results yellow only.

Part C: AaBbCCDD

Explanation:

aaBBCCDD (blue) x AAbbCCDD (purple)----Parents

                 aBCD        AbCD --------------------Gametes

             AaBbCCDD (Green)---------F1 genotype.

PartD:

Green

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