A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that they are unable to produce viable offspring. What kind of evolutionary barrier could this be? Chromosomal or
Postzygotic or
Physical

Question

A scientist tries to mate the two similar-looking fruit flies Drosophila melanogaster and Drosophila simulans. But he finds that they are unable to produce viable offspring. What kind of evolutionary barrier could this be? Chromosomal or
Postzygotic or
Physical

anonymous · Answer

Most appropriate one is B post zygotic. They're stating that they can't produce VIABLE offspring, which means they CAN produce offspring, but they don't survive.