Nondisjunction could be the reason that a red-eyed male is among the offspring of a cross between a red-eyed male fruit fly and a white-eyed female fruit fly.

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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during meiosis, resulting in gametes with an abnormal number of chromosomes. In fruit flies, the gene for eye color is located on the X chromosome. If nondisjunction occurs during meiosis in the male fruit fly, he may produce gametes with an extra X chromosome, which can result in offspring with red eyes instead of the expected white eyes.

Nondisjunction Could Be the Reason That a Red-Eyed Male Is