Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

work input is how much work you put into a machine and work output is the work done by the machine according to how much work you put into it. i think?

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)