...During repeated somatic cell division, the diploid nucleus undergoes unequal distribution or loss of chromosomes, resulting in haploidization and reverting to haploid cells. This type of life cycle is called a parasexual cycle. Sexual differentiation is induced by changes in environmental factors; in Chlamydomonas, gamete formation is induced by removing the nitrogen source from the culture medium, and in Spirogyra, gamete formation is induced by raising the pH of the medium. *Some of the terminology that refers to "parasexual cycle" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この複相核は,体細胞分裂をくりかえす過程で,染色体の不均等配分あるいは消失によって染色体は単相化し,単相の細胞に戻る。このような生活環は準有性生殖(擬似有性生殖)parasexual cycleと呼ばれる。 性の分化は環境要因の変化によって誘導され,クラミドモナスでは窒素源を培養液から除くことによって,またアオミドロなどでは培地のpHを上げることによって配偶子の形成が誘起される。… ※「parasexual cycle」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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