Supernumerary chromosome

Japanese: 過剰染色体 - かじょうせんしょくたい
Supernumerary chromosome

...In contrast, homologous chromosomes that do not differ between males and females are called autosomes. (3) B and A chromosomes Chromosomes that consist only of heterochromatin are called B chromosomes, or supernumerary chromosomes. In contrast, normal chromosomes that contain true chromatin are called A chromosomes. ...

*Some of the terminology that refers to "extra chromosome" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これに対し,雌雄両性の間に違いのみられない相同染色体を常染色体autosomeという。(3)B染色体とA染色体 ヘテロクロマチンだけからなる染色体をB染色体,または過剰染色体という。これに対し,真正クロマチンを含むふつうの染色体をA染色体という。…

※「過剰染色体」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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