A New Drosophila Phenotype Is Investigated with a Series of Crosses

question 6

Multiple Choice

A new Drosophila phenotype is investigated with a series of crosses. P (parental) organisms are true-breeding. The following is the first cross: Which of the following CORRECTLY predict(s) the F₂ results, if the allele that causes the mutant phenotype is X-linked recessive? (Select all that apply.)

• A) 1/4 of the F₂ will be wild type and 3/4 will be mutant.
• B) 2/3 of the wild type will be female and 1/3 will be male.
• C) 1/2 of the F₂ will be mutant and all will be male.
• D) 1/4 of the F₂ will be mutant and all will be male.
• E) 3/4 of the F₂ will be wild type.

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