I know that virgin females must be used when you first begin a cross i.e the P generation. This is because females carry sperm from all previous mating so the eggs (or baby flies) the female produce...
There are 4 chromosome pairs in Drosophila melanogaster. One pair of gonosomes and three pairs of autosomes.
The common fruitfly.
They are most assuredly multicellular. The are fruit flies, a type of insect. Insects are animals, and by definition, animals are multicellular.
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