Why did Morgan choose the fruit fly for his experiments to prove the chromosomal theory of inheritance?

(N/A) Thomas Hunt Morgan and his colleagues performed experimental verification of the chromosomal theory of inheritance.
He conducted his research on the fruit fly,Drosophila melanogaster,for several key reasons:
$1$. They could be grown on simple synthetic media in the laboratory.
$2$. They complete their life cycle in about $15$ days (two weeks).
$3$. $A$ single mating could produce a large number of progeny flies.
$4$. There was a clear differentiation of the sexes; the male and female flies are easily distinguishable.
$5$. They have many types of hereditary variations that can be seen even with low-power microscopes.