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A New Drosophila Phenotype Is Investigated with a Series of Crosses

Question 77

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: 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 F<sub>2</sub> results, if the allele that causes the mutant phenotype is X-linked recessive? (Select all that apply.)  A)  1/4 of the F<sub>2</sub> 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 F<sub>2</sub> will be mutant and all will be male. D)  1/4 of the F<sub>2</sub> will be mutant and all will be male. E)  3/4 of the F<sub>2</sub> will be wild type. 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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