Question

Species Y and Z have very different genes. Species A and B have only a few different genes. What is most likely true about these species?

Answer 1

1 )Species Y and Z are more closely related to each other than species A and B are to each other.
2 )Species A and B are more closely related to each other than species Y and Z are to each other.
3 )Species Y is the ancestor of species A and species Z is the ancestor of species B.
4) All four of these species are probably equally related to each other.