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Sex linkage


In the fruit fly Drosophilia, eye color is sex-linked.
The allele for red eyes is dominant (start text, X, end text, start superscript, W, end superscript) and the allele for white eyes is recessive (start text, X, end text, start superscript, w, end superscript).
A scientist crosses two red-eyed flies and notice that half of their male offspring have white eyes.
What are the genotypes of the parents?
Choose 1 answer: