Aerobic respiration occurs when

In cells, glucose and oxygen react together to create carbon dioxide and water, and energy is released. As oxygen from the air is needed for it to function, the reaction is called aerobic respiration. Energy in the reaction is released. The mitochondria located in the cytoplasm of the cell are where most breathing occurs.

Explanation:

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)