Thomas Hunt Morgan's choice of Drosophila melanogaster has ...

[Hungry!]

Thomas Hunt Morgan's choice of Drosophila melanogaster has been proven to be useful even today. Which of the following has/have continued to make it a most useful species?

I.    its four pairs of chromosomes
II.    a very large number of visible as well as biochemically mutant phenotypes
III.    easy and inexpensive maintenance
IV.    short generation time and large number of offspring

A) I and IV only
B) II and III only
C) I, II, and III only
D) II, III, and IV only
E) I, II, III, IV, and V

[camila]

100% it's E, don't forget to gimmi a thumbs up

[Hungry!]

Thanks so much, you were right on.