遗传系谱题一直是高考考查的重点题型之一。这类题主要考查四个方面:一是显性或隐性性状的判断;二是致病基因的位置;三是亲子代个体的表现型或基因型;四是遗传病发生概率的分析与预测。大部分同学觉得遗传系谱题做起来比较吃力,且易出错。其实,这种题本身并不难,关键是解题的思路不能乱,千万要细心,做到分步解答。只要大家真正掌握了解答这类题的一般方法,也就不觉得难了。 Genetic pedigree questions have always been one of the key questions in the college entrance examination. This kind of question mainly examines four aspects: one is the judgment of dominant or recessive traits; the second is the location of pathogenic genes; the third is the phenotype or genotype of parental offspring; and the fourth is the analysis and prediction of genetic disease occurrence probability. . Most students think that genetic pedigree questions are more difficult and error-prone. In fact, this kind of question is not difficult in itself. The key is to solve the problem in a way that cannot be chaotic. Be careful to do it step by step. As long as everyone has really mastered the general method of answering such questions, it will not be difficult.