形質|けいしつkeishitsu[0]heiban (flat)

1. noun, biology(phenotypic) trait; (hereditary) character
2. noun, biologyallele

• Synonym特性とくせいWrittenWritten/formal prose word for the properties unique to something; it covers materials, organisms and human behavior, but is not limited to biological traits like 「形質」.
• Related性質せいしつNeutralEveryday word for the inherent nature or quality of a person or thing; unlike 「形質」, it is not tied to biological or hereditary traits.
• Related特色とくしょくNeutralA standout feature or strong point, often with an evaluative sense; not a genetics term, so it is no precise substitute for 「形質」 as a hereditary trait.

Use 「形質」 for the form and properties that characterize an organism; it leans biological, as in 「遺伝形質」. For the general nature of a person or thing say 「性質」; for distinctive traits say 「特性」 or 「特色」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 生物せいぶつの特徴とくちょうとなる形かたちや性質せいしつ。