extra small mark chromosome 额外小染色体
The position effects of mark gene and other factors have a little influences on the expect value, but the chromosome length have much influences on it.
标记基因的位置效应和干扰因素对这一期望值的影响是很小的，而染色体的长度对期望方差值影响很大。
Chromosome morphological mark analysis method is too rough and simple to survey single chromosome.
而染色体形态标志分析方法则由于太粗略和简单而不能测量单一的染色体。
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