在未见到高考试题“评分标准答案”前,这道题在“互动平台”栏目网上平台讨论区参与讨论的所有教师所做答案,没有一个与高考命题组提供的答案一致。1题目地中海贫血症属于常染色体遗传病。一对夫妇生有一位重型β地中海贫血症患儿,分析发现,患儿血红蛋白β链第39位氨基酸的编码序列发生了点突变(C→T)。用PCR扩增包含该位点的一段DNA片段l,突变序列的扩增片段可用一种限制酶酶切为大 In the absence of the college entrance examination test scores “score standard answer ”, this question in “interactive platform ” section of the online forum to discuss all the teachers to answer the answers, none of the answers with the college entrance examination proposition. 1 Topic Thalassemia is an autosomal genetic disease. A couple born with a severe β-thalassemia children, analysis found that children with hemoglobin β chain 39 amino acid coding sequence point mutation (C → T). A DNA fragment containing this site was amplified by PCR. The amplified fragment of the mutated sequence can be digested with a restriction enzyme