Atypical - Ikei

Japanese: 異型 - いけい
Atypical - Ikei

...the cell nucleus of the next generation of individuals produced by crossbreeding contains several chromosomes (containing many genes) involved in heredity, but these chromosomes are paired together, with one chromosome inherited from each parent. When we look at the two genes that make up a pair on this pair of chromosomes, they can either have the same function (called homozygous or homomorphic) or different functions (called heterozygous or heteromorphic). When the two genes in a pair are heterozygous, a dominant/subordinate relationship can arise in the function of the genes....

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…交雑によって生ずる次代の個体の細胞核内には,遺伝に関与するいくつもの染色体(多数の遺伝子を含む)があるが,それらの染色体は2本ずつが対合しており,各1本が両親から伝わったものとなっている。この対合している染色体上の対をなす二つの遺伝子に着目してみると,両者の作用が同じ場合(ホモまたは同型という)と,異なる場合(ヘテロまたは異型という)とがある。対になる二つの遺伝子がヘテロのとき,遺伝子の働きに優劣関係が生ずることがある。…

※「異型」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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