Question

A scientist finds two similar flies that have the same size, coloration, and overall morphology. However, further studies show that no mating is possible between them. How would you interpret the incident?
A. Both flies belong to the same species but different genus.
B. Both flies belong to the same genus but different species.
C. Both flies belong to the same genus and same species.

Answer 1

A scientist finds two similar flies that have the same size, coloration, and overall morphology. However, further studies show that no mating is possiblebetween them. we would interpret the incident that
Both flies belong to the same genus but different species
because for reproduction or mating specie should be same as specie is group of individuals that can interbreed and produce fertile offspring
so correct option is B 
hope it helps

Answer 2

Answer: B. Both flies belong to the same genus but different species.

Explanation:

A genus is a group of distinct species exhibiting some common characteristics. A species can be define as a population of organisms which are capable of inbreeding among themselves and producing viable fertile offsprings.

According to the given situation, the two flies are of same color, size coloration  and overall morphology but studies shows that no mating is possible between them. On the basis of similarity in morphology this can be said that the two flies belong to the same genera (genus) but may be different genetically and physiologically. Therefore the two flies are incapable of breeding among themselves this indicates that they belong to different species.