Suppose That You Examine a Vial of 100 Flies That

question 36

Multiple Choice

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Suppose also that you see that all the females present are red-eyed and all the males present are white-eyed. 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^wX^w; X^w+Y
• C) X^w+X^w+; X^wY
• D) X^w+X^w; X^w+Y