If both of a pair of homologous chromosomes are missing, nullisomy results.
如果一对同源
色体都缺失了，称为缺体。
If both of a pair of homologous chromosomes are missing, nullisomy results.
如果一对同源色体都缺失了，称为缺体。
At this point esch chromosome consist of a pair of chromatids and the two associated chromosomes are termed a tetrad.
此时
色体由一对色单体构成，这
联合的色体称为四分体。
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