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Why does Mitotic Crossing Over occur in X-linked genes? wrt 'y' gene and 'sn' gene in...

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Why does Mitotic Crossing Over occur in X-linked genes? 

wrt 'y' gene and 'sn' gene in Drosophila melanogaster.

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The crossing over happens because the two alleles that make up the parent chromosomes are so close together, occasionally a gene on one allele can get "stuck" to the other allele, and the genes can switch places. Kinda like squishing two ropes of play-doh together, then trying to pull them apart-sometimes you have some transference of play-doh.

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