Suppose That You Examine a Vial of 100 Flies That

question 28

Multiple Choice

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Also suppose that you find both red-eyed females and white-eyed females, as well as both red-eyed males 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 describes the genotypes of the parents?

• A) X^w+X^w+; X^wY
• B) X^w+X^w; X^wY
• C) X^w+X^w; X^w+Y
• D) X^wX^w; X^w+Y

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