Astronomers have come up with an educated approximation of a to ratio for large-impact events.

Astronomers have come up with an educated approximation of a crater to object ratio for large-impact events.

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)

bc blah

explanation:

bc blah