Some snake venoms are harmful because they contain enzymes that destroy blood cells or tissues. the damage cause by such a snakebite could best slowed by

they are known to reach a speed of 21 miles per hour

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)