what is the main function of nervous tissue? a: to transport materials and defend the body, b. send signals to control the body, c. contract the casue movement in the body, d. cover the body to protect other cells

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)