专题限时训练(三十七)　[科普知识型阅读理解(一)]

　　(限时：25分钟)

　　(一)

　　DNA left at a crime scene could be used in the future to build up a picture of an offender's face, which was revealed tonight.

　　A first step towards genetic mugshots has been taken by researchers in the US who link specific DNA markers with face shapes. To identify the genes, they focused on known mutations(突变) that cause changes of the face and head. Normal versions of these genes were found to influence individual features. For instance, one gene affected the lips, another the shape and configuration of bones around the eyes, and a third the appearance of the mid­face and skull. In total, 20 genes had “significant effects” on facial appearance.

　　Lead scientist Professor Mark Shriver, from the Pennsylvania State University, said, “We use DNA to match to an individual or identify an individual, but we can get so much more from DNA. Currently we can't go from DNA to a face, or from a face to DNA, but it should be possible.” The implications are far­reaching, raising the possibility of creating a data bank of facial types based on genetic markers. DNA from a crime scene could then be used to produce a rough image of the face of an offender or victim. Such genetic mugshots may be more reliable than computer­generated “E­fits” based on witnesses' memory. Other uses of the technique might include proving the identities of fathers in paternity cases, or visualizing our remote ancestors from fossil DNA.

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