What do you call a person who studies plants and animals?

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)

the darker peppered moth species were favored due to the fact that the industrial revolution had made all the nearby trees a darker color instead of white.