A new Drosophila phenotype is investigated with a series of crosses. P (parental) organisms are trưe- breeding. The following is the first cross: P wild-type female x mutant male F1 all wild type F2 Predict the F2 results if the allele that causes the mutant phenotype is X-linked recessive. Then predict the results if the allele causing the mutant phenotype is mitochondrial.

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