英语翻译Therefore,a begging nestling that secures food at the ex

句子结构
　　连接性状语：Therefore
　　主语部分：a begging nestling that secures food at the expense of its siblings
　　【核心名词】a begging nestling 一只乞食的雏鸟
　　【定语从句】that secures food at the expense of its siblings 在排斥它的兄弟姐妹的情况下获得食物的（雏鸟）
　　谓语部分：might actually leave behind fewer copies of its genes overall than it might otherwise.
　　【谓语动词及其修饰语】might actually leave behind … overall总的说来事实上会失去
　　【宾语】fewer copies of its genes其基因中更少的相同部分
　　【比较状语从句】than it might otherwise 比它会在其他方面失去的相同部分
参考译文：一只在排斥同窝雏鸟的情况下获得食物的乞食雏鸟,与它在其他方面失去基因相同部分比起来,总的来说实际上会失去的更少.

楼主再给出，前后的句子吧，单单一句，没有语境，翻译起来比较困难。
结构分析that secures food at the expense of its siblings修饰前面的 a begging nestling。
主体部分a begging nestling might actually leave behind fewer copies of its genes over...