In Drosophila, the yellow (y) gene is near the telomereof the long arm of the acrocentric X chromosome,while the singed (sn) gene is located near the middle ofthe same X chromosome arm. On the wings of femaleflies of genotype y sn / y+ sn+, you can very rarely findpatches of yellow tissue within which a small subset ofcells also have singed bristles.a. How can you explain this phenomenon?b. Would you find similar patches on the wings offemales having the genotype y+ sn / y sn+?

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