Which among the following is true about Drosophila melanogaster ?

All of these .

The correct answer is Option (4) –All of these .

Experimental verification of the chromosomal theory of inheritance by Thomas Hunt Morgan and his colleagues, led to discovering the basis for the variation that sexual reproduction produced. Morgan worked with the tiny fruit flies, Drosophila melanogaster, which were found very suitable for such studies.

They could be grown on simple synthetic medium in the laboratory.

They complete their life cycle in about two weeks, and a single mating could produce a large number of progeny flies.

Also, there was a clear differentiation of the sexes – the male and female flies are easily distinguishable. Also, it has many types of hereditary variations that can be seen with low power microscopes.