以下为句子列表：
英文: Aneuploidy The condition, resulting from nondisjunction of homologous chromosomes at meiosis, in which one or more chromosomes are missing from or added to the normal somatic chromosome number.
中文: 非整倍性：在减数分裂的过程中同源染色体不分离而造成的一条或多条染色体的缺失或增加。
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英文: Bivalent Describing any pair of homologous chromosomes when they pair up during MEIOSIS.
中文: 二价染色体：在减数分裂中配对时的任意一对同源染色体。
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英文: Homologous chromosomes have chromomeres in identical places along their length.
中文: 同源染色体在相同的部位具有染色粒。
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英文: If both of a pair of homologous chromosomes are missing, nullisomy results.
中文: 如果一对同源染色体都缺失了，称为缺体。
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英文: Pairing of homologous chromosomes (synapsis) commences at one or several points on the chromosome and is clearly seen during PACHYTENE of meiosis I.
中文: 同源染色体两两成对平行靠拢，这一现象也称联会，联会发生在染色体的一点或多点上，可以在减数第一次分裂的粗线期观察到。
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