Suppose we cross a wild-type Drosophila with a mutant Drosophila that has vestigial wings and white eyes. We then perform a test cross with the F1 true-breeding individual and obtain the following result in the F2 progeny:

Using the chi-square test, which of the following conclusions is therefore true?

• A. The two genes are linked
• B. The two genes are not linked
• C. The two genes are too close to each other
• D. The two genes are not expressed

Answer: (A)