Individuals crossing exclusively within the same population produce more progeny than those crossing in both directions and thereby use up some of their gametes for the production of inviable hybrids . 完全在同一种群内进行杂交的个体比以两个方向进行杂交的个体繁殖后代要多，因此为了产生无生机的杂种，就要消耗掉一些配子。
2.
The reason that caused the problem loans are broken down into the following : ( 1 ) the policy reasons . the policies in former command economy forced some loan into inviable soes or unprofitable projects . ( 2 ) the economic reasons 在这些理论分析的基础上，本文将进一步探索我国银行不良贷款问题的特殊原因，这些因素既有外部的，也有内部的，当然经济层面上的原因也是其中之一。
3.
But now , mpeg2 ' s compressing and decompressing algorithms and mechanism is inviable to mapc - ca ' s architecture , the hardware can not efficiently work . aim at these mostly questions of mpeg2 ' s real - time handling , mpeg2 ' s video coding and decoding system based on map - ca have been implemented . mpeg2 ' s key algorithms have been improved 针对mpeg2实时处理中面临的主要问题，课题基于mapca实现了mpeg2实时编码解码系统；改进了mpeg2关键算法，提出了新的实现方法，如量化反量化算法， dct变换idct变换算法，运动估计算法等；利用datastreamerdma控制器进行数据传输，最大限度地减少数据等待时间。
