医学遗传学 04基因突变的分子机制eng v.ppt
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1、04 基因突变的分子细胞生物学效应 cellular effects of gene mutation,1.Genes can be mutated in many ways,The most common gene change involves a single base mismatch-a misspelling-placing the wrong base in the DNA.At other times,a single base may be dropped or added.And sometimes large pieces of DNA are mistakenly re
2、peated or deleted.,When a gene contains a mutation,the protein encoded by that gene is likely to be abnormal.,2.Somatic versus germline mutations,Gene mutations can be either inherited from a parent or acquired.,Hereditary mutations are carried in the DNA of the reproductive cells.When reproductive
3、cells containing mutations combine to produce offspring,the mutation will be in all of the offsprings body cells.,The fact that every cell contains the gene change makes it possible to use cheek cells or a blood sample for gene testing.,Acquired mutations are changes in DNA that develop throughout a
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