cell population phenotype decreased mating efficiency A biological process phenotype in which the observed mating efficiency, as determined by counting zygotes, asci, and sometimes spores, is lower than normal. 2011-12-05T04:26:20Z midori mating efficiency: decreased FYPO:0000708 reduced mating efficiency Note that mating efficiency is often measured by counting zygotes plus asci, sometimes also including spores, so a change in measured mating efficiency may reflect a change in conjugation frequency (see FYPO:0000031 and its descendants), a change in sporulation (see FYPO:0000121 and its descendants), or both. For this reason, this term is not a child of 'mating phenotype' (FYPO:0000031). abnormal phenotype