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Sex-linked traits

Problem

In Drosophila flies, eye color is sex-linked. The allele for red eyes (Xstart superscript, start text, W, end text, end superscript) is dominant to the allele for white eyes (Xstart superscript, start text, w, end text, end superscript).
A male fly with red eyes Xstart superscript, start text, W, end text, end superscriptY and a carrier female Xstart superscript, start text, W, end text, end superscriptXstart superscript, start text, w, end text, end superscript are mated.
What is the probability that the female offspring will have white eyes?
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