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?
A) Chromosomal
B) Postzygotic
C) Physical
ANSWER QUESTION SAP

Answer 1

The answer is B, Post zygotic

Answer 2

Answer:

B) Postzygotic

Explanation:

If the offspring resulting from the crossing of the two fly species is not viable, it means that although the hybrids were produced, they do not have the biological characteristics to survive and therefore, that there is a postzygotic barrier (it occurs after the zygote has formed).

A postzygotic barrier is  condition that prevents hybrids from surviving (dying) or reproducing (infertility).