染色体

• Absence of one chromosome of a pair is called monosomy for that chromosome .
  一对染色体中缺少了一条染色体就称为该染色体的单体。
• Malignant segregants may, therefore, arise when complementing chromosomes are lost .
  因此当互补染色体丢失时，就会产生恶性分离子。
• The x-chromosome has many genes for which there are no paired genes on the y-chromosome .
  X染色体有许多在Y染色体上不能配对的基因。
• Morgan evinced no doubts about the relationship between genes and chromosomes .
  摩尔根雄辩地证明了关于基因和染色体之间的相互关系。
• The nuclei, located in the vegetative cells, each contain one set of seven chromosomes .
  位于营养细胞中的每个核含有一套七条染色体。
• Each chromosome consists of two chromatids held together by the centromere .
  每个染色体由两个染色单体所组成，它们被一个着丝点联结在一起。
• Cross-overs have occurred independently of each other between pair of homologous chromosomes .
  交换现象独立地在每一对同源染色体之间发生。
• In mammalian species, a variety of chromosomal rearrangements are known to exist .
  在哺乳类的物种中，已知有许多类型的染色体内部重新排列。
• These chromosomes are so simple that some geneticists prefer to call them chromonemes .
  这些染色体结构简单，许多遗传学家喜欢称它们为染色丝。
• The second process involves another type of genetic accident called a chromosomal translocation .
  第二种过程涉及到称为染色体移位的另一类基因故障。