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Describe the eye colours that may be exhibited by flies bearing each of the mutations specified

- Flies

homozygous for a small deletion in the promoter of white that impairs RNA polymerase binding, resulting in expression of only 10% of the normal amount of the protein product.

- Flies that are heterozygous for a mis-sense mutation within the coding region of scarlet which suppresses ubiquitination and proteosomal degradation of the gene product.

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