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  3. It is a wise father that knows his own child, but today a man can boost his paternal(fatherly)wisdom — or at least confirm that

It is a wise father that knows his own child, but today a man can boost his paternal(fatherly)wisdom — or at least confirm that

admin2014-02-25  31
问题     It is a wise father that knows his own child, but today a man can boost his paternal(fatherly)wisdom — or at least confirm that he’s the kid’s dad. All he needs to do is shell out $30 for paternity testing kit(PTK)at his local drugstore — and another $120 to get the results.
    More than 60,000 people have purchased the PTKs since they first become available without prescriptions last years, according to Doug Fogg, chief operating officer of Identigene, which makes the over-the-counter kits. More than two dozen companies sell DNA tests directly to the public, ranging in price from a few hundred dollars to more than $2,500.
    Among the most popular: paternity and kinship testing, which adopted children can use to find their biological relatives and families can use to track down kids put up for adoption, DNA testing is also the latest rage among passionate genealogists — and supports businesses that offer to search for a family’s geographic roots.
    Most tests require collecting cells by webbing saliva(唾液)in the mouth and sending it to the company for testing. All tests require a potential candidate with whom to compare DNA.
    But some observers are skeptical. "There is a kind of false precision being hawked by people claiming they are doing ancestry testing," says Trey Duster, a New York University sociologist. He notes that each individual has many ancestors — numbering in the hundreds just a few centuries back. Yet most ancestry testing only considers a single lineage(世系), either the Y chromosome(染色体)inherited through men in a father’s line or mitochondrial(线粒体)DNA, which is passed down only from mothers. This DNA can reveal genetic information about only one or two ancestors, even though, for example, just three generations back people also have six other great-grandparents or, four generations back, 14 other great-great-grandparents.
    Critics also argue that commercial genetic testing is only as good as the reference collections to which a sample is compared. Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects. This means that a DNA database may have a lot of data from some regions and not others, so a person’s test results may differ depending on the company that processes the results.
A problem commercial genetic testing faces is______.
选项 A、disorganised data collection
B、overlapping database building
C、excessive sample comparison
D、lack of patent evaluation
答案A
解析 根据题干中的commercial genetic testing将本题出处定位于末段。末段首句提到，批评家们还说商业性基因检测的可靠性仅与信息收集一样。第2句提到，一些公司数据库里的数据并非系统性地收集而得，而是将不同研究项目的信息集中到一起，由此可知，答案为A)，其中的disorganised data collectiong对应原文中的don’t rely on data collected systematically。根据第3句排除B)“数据库重复建设”和C)“过度的样本比对”。D)“缺少专利评估
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