1.Condition in which one allele is dominant over
the other​

Ithink the answer is a or d i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.