Suppose in Drosophila, the eye color and wing size genes are located on the same chromosome and separated by 25 map units. Allele B produces brown eyes and is dominant to b for blue eyes, and allele L produces large wings and is dominant to l for small wings.

A heterozygous individual with the genotype BL/bl produces gametes. Which of the following gives the frequency of parental genotype?

• A. 25%
• B. 50%
• C. 100%
• D. 75%

Answer: (D)