In Drosophila, the Recessive Allele P, When Homozygous, Determines Pink

question 69

Multiple Choice

In Drosophila, the recessive allele p, when homozygous, determines pink eyes.Pp or PP results in wild-type eye color.On the same chromosome of Drosophila that carries the p (pink eyes) locus there is another locus that affects the wings.Homozygous recessives, byby, have blistery wings, while the dominant allele By produces wild-type wings.The P and By loci are very close together on the chromosome; that is, the two loci are tightly linked.Assume that no crossing over occurs, and that the F₂ generation is produced by interbreeding the F₁ progeny.For the cross PPbyby  ppByBy, what is the phenotype ratio of the F₂ generation?

• A) 1 wild-type eyes/blistery wings : 2 wild-type eyes/wild-type wings : 1 pink eyes/wild-type wings
• B) 1 wild-type eyes/wild-type wings : 2 wild-type eyes/blistery wings : 1 pink eyes/wild-type wings
• C) 1 pink eyes/wild-type wings : 2 pink eyes/blistery wings : 1 wild-type eyes/blistery wings
• D) 1 wild-type eyes/blistery wings : 2 pink eyes/blistery wings : 1 pink eyes/wild-type wings
• E) 1 pink eyes/blistery wings : 2 wild-type eyes/blistery wings : 1 wild-type eyes/wild-type wings

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