Meiosis

Japanese: meiosis
Meiosis

…Since many cells that no longer divide enter G0 at the beginning of G1 and then continue to differentiate and die, it is thought that cellular senescence begins in the G1 phase.
[Meiosis]
There are two types of cells: somatic cells and germ cells. Germ cells ensure the continuation of an organism's genetic information and allow for the regeneration of younger generations. The cells that become germ cells are called primordial germ cells, and they have morphological characteristics that distinguish them from other tissue cells from an early stage of development.

*Some of the terminology that mentions "meiosis" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…分裂しなくなった細胞は多くG1期の初めからG0にはいって停止しており,そこから分化を続けて死に至ることから,細胞の老化はG1期で始まると考えられる。
[減数分裂meiosis]
 細胞には体細胞と生殖細胞とがあり,生殖細胞によってその生物のもつ遺伝情報の継続が約束され,世代の若返りが可能になる。生殖細胞の元になる細胞は始原生殖細胞と呼ばれ,発生の早い時期から他の組織細胞と区別されるような形態的特徴をもっている。…

※「meiosis」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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