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Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and ...

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Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and ...

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross, and you find only red-eyed females and red-eyed males present. You allow these flies to interbreed, and in the next generation you find all the females are red-eyed, but you find both red-eyed and white-eyed males. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w). Which of the following best describes the genotypes of the original parents?

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X^w+X^w+; X^wY

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X^w+X^w; X^w+Y

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X^w+X^w; X^wY

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X^wX^w; X^w+Y

Textbook

Biology: Exploring the Diversity of Life

Edition: 4^th

Authors: Russell, Hertz, McMillan, Fenton

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