染色体

• Sax found average chiasma frequencies of 2.3 to 2.5 per bivalent in pines and larches .
  Sax发现松树和落叶松每条二价染色体的平均交叉频率是2.32.5。
• Translocation occurs when a fragment of one chromosome becomes attached to a non-homologous chromosome .
  一段染色体跟非同源染色体连在一起时就发生易位。