论文部分内容阅读
遗传基本规律是解题的依据,但在特殊条件下,会出现不符合遗传规律的特例,因此解决特例要用特殊方法。有关特例问题是近几年各地高考的高频考点,下面通过分析遗传与变异的特例,感悟解题规律。一、基因互作引起分离比异常基因一般都不是独立起作用的,生物的性状也往往不是简单地决定于单个基因,而是不同的基因相互作用的结果。两对等位基
The basic laws of genetics are the basis for solving problems, but under special conditions, special cases that do not conform to the laws of heredity occur. Therefore, special cases should be solved for solving special cases. The special case is the high frequency test centers around the college entrance examination in recent years, the following by analyzing the special cases of genetic and mutation, perception problem solving law. First, the gene interaction caused by the separation than abnormal Genes are generally not independent of the biological traits are often not simply decided by a single gene, but the result of different gene interactions. Two pairs of bases