Fractional notation: a style of genotypeplugin-autotooltip__default plugin-autotooltip_bigGenotype: the combination of alleles within an organism or strain. When used as a verb, it means to determine the genotype experimentally. notation that uses “fractions”, e.g., $\frac{unc\text{-}4}{+}$. We strongly encourage this notational style as it generally is preferred by genetics researchers.