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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

admin2016-01-10  29
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 to 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 year, according to Doug Fogg, chief operating officer of Identigene, which makes the over-the-counter(无需处方的)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(亲属关系)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(系谱学者)— and supports businesses that offer to search for a family’ s geographic roots.
    Most tests require collecting cells by swabbing 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’ s a kind of false precision being hawked by people claiming they are doing ancestry testing," says Troy 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, either the Y chromosome(染色体)inherited through men in a father’ s line or mitochondrial(线粒体的)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. In addition, the computer programs a company uses to estimate relationships may be patented and not subject to peer review or outside evaluation.
PTK is used to______.
选项 A、locate one’ s birth place
B、promote genetic research
C、identify parent-child kinship
D、choose children for adoption
答案C
解析 细节题。文章第一段提到PTK被男人用来确认自己是孩子的父亲(confirm that he’sthe kid’s dad)，第三段又提到PTK可以帮助被收养的儿童找到和自己有血缘关系的亲属，也可以帮助家庭找回被人抚养的孩子，由此可以确定C项为正确答案。
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