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If a Drosophila is having XXY sex chromosomal combination with one X bearing white allele for eye colour and another X having eosin allele for eye colour, what would be its phenotype?

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If a Drosophila is having XXY sex chromosomal combination with one X bearing white allele for eye colour and another X having eosin allele for eye colour, what would be its phenotype?

(a) This is a lethal combination

(b) White eyes

(c) Red eyes

(d) Eosin eyes

I had been asked this question in an interview for internship.

Query is from Multiple Alleles in portion Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

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The correct answer is (d) Eosin eyes

Explanation: Eosin eye colour is dominant over white eyes. In this case, the combination is not lethal and the fly is a female with eosin eye colour.

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