A method of selective breeding. Cultivated crops and native livestock varieties are a mixture of individuals with slightly different genetic qualities, forming a heterogeneous population. This breeding method creates new varieties by selecting homogeneous individuals (groups) with specific desirable genetic qualities from such populations, or conversely, by removing inferior genetic qualities. This breeding method has been used longer than other breeding methods and has achieved great results, but its scientific basis was provided by WL Johansen's pure line theory (1903). Source: Heibonsha World Encyclopedia, 2nd Edition Information |
品種改良の手法の一つ。栽培されている農作物,家畜の在来品種は,多少とも遺伝質が違う個体が混ざって雑ぱくな個体群を形成している。このような個体群の中から特定の好ましい遺伝質をもつ均一な個体(群)を選抜したり,あるいは逆に不良な遺伝質を除去したりして新品種を作りだす育種方法である。この育種法は他の育種法よりも古くから利用されて大きな成果を上げてきたが,その科学的根拠はW.L.ヨハンセンの純系説(1903)によって与えられた。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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