maternal line的用法和樣例：
例句
- Everyone has two paternal grandparents and two maternal grandparents.
每個(gè)人都有兩個(gè)屬于父系的祖父母和母系的祖父母。 - For most genes, both the maternal and paternal alleles turn on or off at the same time.Imprinting disrupts this balance.
對多數基因來(lái)說(shuō)，來(lái)自父系及母系的對偶基因是同時(shí)開(kāi)啟或關(guān)閉的，銘印則破壞了這種平衡。
