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Fruit flies normally have dull red eyes. Some fruit flies have white eyes due to mutation in a gene on the X-chromosome. The

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Answer #1

White eyed flies = XwXw, XwY

Red eyed flies = XX, XwX, XY

XwXw (white eyed female) × XY (red eyed male)

Gametes Xw
X XwX red eyed female
Y XwY white eyed male

In this cross, there will be no female with red eyes. So, answer is 0.

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