A female fruit fly with the recessive mutant phenotype of white eyes and miniature wings is mated with a male possessing the wild-type phenotype of red eyes and normal wings
Among the F1s, all the females are wild-type while all the males exhibit the mutant phenotype. The F2s resulting from a testcross exhibit predominantly (63%) parental phenotypes. How do you explain these results?
Since there is a significant deviation from the expected 1:1 ratio of parental and recombinant phenotypes in the F2 offspring of the testcross, the genes for eye color and wing type must be linked. Furthermore, the F1 phenotypes indicate that the genes are X-linked.
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