当甲基加到组蛋白后，这些基团会修饰它的性质并改变它上面特定基因的表达频率。
When methyl groups are added to a histone, they modify its properties and alter the frequency at which a particular gene is expressed.
选择加快了群体基因频率的改变，青壳蛋性状确为由一对主效基因控制的完全显性遗传性状。
The result indicate that population gene frequency variety expedite by selection and the test testify green-shell character is controled by a pair of complete dominant allele.
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