Practice Quiz

CLEP Natural Sciences - Biological Science

Category - CLEP Natural Sciences - Biology

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In fruit flies, the gene for eye color is located on the X chromosome, and the red eye allele (R) is dominant to the white eye allele (r). A female fly with genotype XRXr is mated with a male fly with genotype XrY. Which of the following statements best describes the expected outcome of the cross?
  1. The chance of an offspring having red eyes is 75%.
  2. The chance of an offspring having white eyes is 50%.
  3. The chance that a male offspring will have white eyes is 0%.
  4. The chance that a female offspring will have red eyes is 100%.
Explanation
Answer: B - The chance of an offspring having white eyes is 50%.
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