The authors present results for the fluctuation paraconductivity and magnetoconductivity for a single-crystal sample of YBa₂Cu₃O_{7- delta}. Both the paraconductivity and magnetoconductivity data are fitted to existing theories of the Aslamazov-Larkin and Maki-Thompson contributions to the fluctuation conductivity. The presence of a Maki-Thompson contribution in the paraconductivity and magnetoconductivity would suggest that the pairing mechanism is conventional s-wave pairing.