A star is 20 pc away from us. Calculate its parallax angle.

Explanation:

distance to star i n parsecs=1/P.

Explanation:

1/0.25=4 Parsecs.enter image source here

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)

there’s no image attached but i can if you want: )