Sex-linked traits Transitional Reasoning Practice

Questions

1. 1.

   In fruit flies (Drosophila melanogaster), eye color is an X-linked trait where the allele for red eyes ($X^R$) is dominant to the allele for white eyes ($X^r$). A geneticist crosses a red-eyed female whose father had white eyes with a red-eyed male. Based on the patterns of sex-linked inheritance, which statement correctly predicts the phenotypic distribution among the resulting offspring?

   • A) All male offspring will have white eyes, while all female offspring will have red eyes.
   • B) Half of the female offspring will have white eyes, and half of the male offspring will have red eyes.
   • C) Approximately 25% of all offspring will be white-eyed females, and 25% will be red-eyed males.
   • D) All female offspring will have red eyes, while half of the male offspring will have white eyes.

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