F2 - F2

Japanese: F₂ - えふに
F2 - F2

…Heterosis is also known as heterosis. When species or varieties of living organisms are crossed, the resulting hybrid often has a stronger constitution and better growth than either of the parents. This phenomenon is called hybrid vigor, and is often used to improve crop and livestock breeds. It was first discovered in corn, and was then observed in animals such as guinea pigs. On the other hand, when allogamous crops (such as corn), which normally reproduce by fertilization between different individuals, are forced to self-fertilize (fertilize within the same individual) or when inbreeding is repeated, the growth of the offspring (progeny) often becomes gradually poorer. …

*Some of the terminology explanations that mention "F2" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ヘテローシスheterosisともいう。生物の種間または品種間の交雑を行うと,その一代雑種はしばしば両親のいずれよりも体質が強健で発育がよいという現象がみられる。これを雑種強勢といい,農作物,家畜の品種改良にしばしば利用される。最初トウモロコシで発見され,ついで動物でもモルモットで認められた。 一方,異なった個体間の受精によって繁殖することを常態とする他殖性作物(トウモロコシなど)を,強制的に自殖(同一個体内で受精させる)させたり,近親間の交配を繰り返したりすると,子孫(後代)の生育がしだいに劣ってくる例が多い。…

※「F₂」について言及している用語解説の一部を掲載しています。

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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