Mendel's law of segregation states that during meiosis, the factors that control each trait separate, and only from each pair is/are passed to the offspring.

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)

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.