To study sex linkages in Drosophila, Morgan mated white eyed males with wild type red eyed females. What will be the phenotye of offspring?
Correct answer: A. All red eyed males and females
- A. All red eyed males and females
- B. Red eyed females and white eyed males
- C. White eyed females and red eyed males
- D. All white eyed females and males
Explanation
In Drosophila melanogaster, the gene for eye color is located on the X chromosome, and the white-eyed trait is a recessive mutation. The wild type, or normal, eye color in Drosophila is red, which is the dominant trait. When white-eyed males (homozygous for the recessive trait) are mated with wild type red-eyed females (homozygous for the dominant trait), the offspring will inherit one X chromosome from each parent. Since the white-eyed trait is recessive, the presence of a dominant red-eyed allele on the other chromosome will result in the offspring having red eyes. Therefore, all the offspring, both males and females, will have red eyes.
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