CONCLUSION
After this brief investigation, I hope that you have all the necessary to solve the second clue.
But first, solve the following question and give the answer to your inspector. If you are right, she will give you the next clue.
A human female "carrier" who is heterozygous for the recessive, sex-linked trait red color blindness, marries a normal male.
What proportion of their female progeny will show the trait?
Luck.