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。
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.
其作用水平主要有三种：位置效应、转录水平的基因沉默和转录后水平的基因沉默。
The positions where transgene silencing occurs mainly are inserting position? transcriptional gene silencing and posttranscriptional gene silencing.
应用推荐