If a homozygous blood type B father and a blood type O mother produce a child, what is the probability that the child will have blood type B?

Ineed to know why d is the correct answer asap

Next pretest: evolution select the correct answer in a laboratory population of flies, the female flies are gray and the males are yellowish gray. biologists observed that all the male flies had an equal chance for reproduction, but the male flies with the brightest colors were more likely to successfully reproduce. what phenomenon could explain such a change? a sexual selection b. disruptive selection c. stabilizing selection d. directional selection

Describe the function of the endomembrane system? what organelles are involved?