ニホンジカにおける染色体多型現象について

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書誌事項

タイトル別名
  • Chromosome polymorphism in Japanese sika, Cervus (Sika) nippon.
  • ニホンジカにおける染色体多型現象について〔英文〕
  • ニホンジカ ニ オケル センショクタイ タケイ ゲンショウ ニ ツイテ エイブ

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説明

Chromosome examination by blood culture was conducted on 35 Japanese sika, Cervus (Sika) nippon, revealing that the number of chromosomes varied according to individuals, such as 65, 66, 67 and 68. This numerical variation depended on the presence or absence of large metacentric chromosomes and submetacentric chromosomes in the autosomes. It was possible to observe six karyotypes according to the presence or absence of these two kinds of chromosomes. Polymorphism of these chromosomes is presumed to be formed when either large metacentric chromosomes or submetacentric chromosomes are formed following fusion of four acrocentric chromosomes in the autosomes at the centromere. The fundamental number was constant, 70 in all cases. This is considered to be due to the so-called Robertsonian translocation. The common phenomenon observed in all the individuals examined was the presence of one pair of middle-sized metacentric chromosomes in the autosomes. The X-chromosome was the largest among the acrocentric chromosomes and the Y-chromosome could be easily identified as a small submetacentric chromosome.

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