How many sperm cells are formed from an original cell in a drosophila fruit fly at the conclusion of meiosis?

Four sperm cells.

Explanation:

Meiosis is is a cell division process that generates four haploid cells (gametes) from a single diploid germline cell. In males, meiosis is part of spermatogenesis, the process to generate sperm. Sperm are the haploid cells that are generated in meiosis.

Meiosis is a highly conserved cell division process in eukaryotes that produces 4 cells (gametes) from a single cell (mother). However, Nondisjunction in male of Drosophila causes frequently sperm with a gain or loss of chromosomes.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.