Answer
17%, which is consistent with Fig. 15.9.
Work Step by Step
To get this number, find the percentage of the total individuals (1883-add up all flies listed in the question) represented by the recombinants (black-normal and gray-vestigial; 320). Do a similar calculation with the numbers in Fig. 15.9 and you will get a similar frequency, expected since the same genes are being looked at here and in Fig. 15.9.
