普通遗传学教材中n，x和染色体基数的概念问题

普通遗传学有关教材中，对n，x和染色体基数之间关系的叙述常使学生在概念上造成混乱．事实上，遗传学上把一个正常配子中所包含的染色体数，称为染色体组（Genome），用n表示，这是指大多数生物是二倍体而言．由于引入了染色体基数x的概念，因此，在异源多倍体中的非整倍体生物中，应强调只有具偶数染色体组的生物体才有可能产生单体、三体、四体、双三体和缺体这类染色体数目的变异．就普通遗传学教材中n，x和染色体基数的概念问题进行了分析和讨论．

Talking the concept of n,x and chromosome basic number in general genetics textbooks

In general genetics textbooks, the relation between n,x and chromosome basic number is obscure to the more students . In effect, the chromosome which contained in a normal in genetics refer to n as genome. This is that the more organism is all diploid. The chromosome basic number, x, the concept is introduced, then, only the organism with even genome can can produce monosomics, trisomics, tetrasomics, ditrisomics and detesomics of the varication of chromosome number in the heteropolyploid and noneuploid. Theis paper analysis the cause and discussion to the concept of n,x and chromosome basic number.