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Drosophila melanogaster is a model organ...

Drosophila melanogaster is a model organism in genetic studies. Justify?

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They could be grown on simple synthetic medium in the laboratory.
They complete their life cycle in about two weeks Single mating could produce a large number of progeny flies.
There is clear differentiation of sexes.
Hereditary variations can be seen in low power microscopes.
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OSWAAL PUBLICATION-PRINCIPLES OF INHERITANCE AND VARIATIONS -(TOPIC 2 ) (SEX DETERMINATION AND GENETIC DISORDERS (SHORT ANSWER TYPE QUESTIONS-I))
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