W

Red-eyed male

Dies

These flies are female because their X: A ratio = 1

Conclusion: Nondisjunction results in white-eyed females and red-eyed males.

These flies are female because their X: A ratio = 1

Conclusion: Nondisjunction results in white-eyed females and red-eyed males.

4.15 Bridges conducted experiments that proved that the gene for white eyes is located on the X chromosome. (a) A white-eyed female was crossed with a red-eyed male. (b) Rare nondisjunction produced a few eggs with two copies of the XW chromosome and other eggs with no X chromosome.

the appearance of an occasional odd fly in his culture but that he was able to predict a fly's chromosomal makeup on the basis of its eye-color genotype. This association between genotype and chromosomes gave unequivocal evidence that sex-linked genes were located on the X chromosome and confirmed the chromosome theory of inheritance.

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