When a virus invades a host the most common threat is
a. production of viral fluids in the bloodstream.
b. fermentation of acids in the digestive system.
c. destruction of cells by viral reproduction.
d. stimulation of muscle tone in the heart.

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)

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.