What do the Drosophila Dscam proteins do? If Drosophila brains have100,000 neurons, about how many different possible connections are possible betweenthose neurons? How many genes do Drosophila have? Use these numbers toexplain: why does it make sense that many thousands of Dscam protein variantswould be generated by alternative splicing from a single gene as opposed toalternative regulation from many Dscam genes?