...There are cases where organisms in a genus or species have a ploidy of chromosome numbers. For example, the three types of wheat called einkorn, diploid, and common (represented by einkorn, durum, and bread wheat) have somatic cell chromosome numbers (represented by 2n ) of 14, 28, and 42, respectively. This ploidy of chromosome numbers is called polyploidy. The number of chromosomes in the gametes of the species with the fewest number of chromosomes in this ploidy series is called the basic number, and is represented by x . *Some terminology explanations that mention "polyploid" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…一つの属または種に含まれる生物の間に,倍数関係にある染色体数のみられることがある。例えば,一粒系,二粒系,普通系とよばれる3系のコムギ(それぞれの代表は一粒コムギ,マカロニコムギ,パンコムギ)は体細胞の染色体数(2nで表す)が14,28,42である。染色体数にみられるこのような倍数関係を倍数性という。この倍数系列のうち,もっとも染色体数の少ない種の配偶子の染色体数を基本数basic numberとよび,xで表す。… ※「polyploid」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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