noun
quantitative trait; quantitative character
Technical term in biology, especially genetics, for a measurable phenotype that varies continuously and is influenced by multiple genes and the environment.
身長や体重は代表的な量的形質です。
Height and weight are typical quantitative traits.
量的形質の遺伝解析には統計的手法が用いられる。
Statistical methods are used for genetic analysis of quantitative traits.
質的形質 (qualitative trait) refers to discrete, categorical traits controlled by one or a few genes, while 量的形質 is continuous and polygenic.
Compound of 量的 (quantitative) + 形質 (trait, character). A modern scientific term, likely a calque from English 'quantitative trait'.