In Drosophila, M. Green found a singed allele (sn) withsome unusual characteristics. Females homozygous forthis X-linked allele have singed bristles, but they havenumerous patches of sn+ (wild-type) bristles on theirheads, thoraxes, and abdomens. When these flies aremated with sn males, some females give only singedprogeny, but others give both singed and wild-type progeny in variable proportions. Explain these results.

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