When people answer your question with “hey the answer is in this file here’s the link” is that safe?will it give you a virus?

It depends on the file but I recommend to just not open the file and answer a different question just to be safe.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)