Aswimmer can swim 4 laps every 3 minutes . if he can swim for 15 minutes how many laps will he complete? a. 10 laps b. 12 laps c. 15 laps d. 20 laps

20 laps

15/3=5    5x4=20

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)