Which of the following is not a method that maintains lymph flow?
-skeletal muscle contraction
-capillary smooth muscle contraction
-breathing
-valves in lymph vessel walls

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)

that is wrong, its not thymus.