A red-eyed female fruit fly is crossed with a red-eyed male fruit fly. All of the female offspring have red eyes but only one-half of the male offspring are red-eyed. The other half of the male offspring have white eyes. In this example, eye color in fruit flies

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Eye color in fruit flies is an X-linked trait, as evidenced by the pattern of inheritance seen in the offspring. Since males have only one X chromosome, they are more likely to express recessive traits like white eyes if the gene is located on the X chromosome.

A Red-Eyed Female Fruit Fly Is Crossed with a Red-Eyed