考博考试

【单选题】It is a wise father that knows his own child, but today a man can boost his patemal(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 toDoug Fog, chief operating officer of Identigene, which makes the over-the-counter kits．More than two dozen companies sellDN
A、tests directly to the public, ranging in price from a few hundred dollars to more than$2500．
Among the most popular：patemity and kinship testing, which adopted children can use to find their biological relatives and 1atest rage a many passionate genealogists—and supports businesses that offer to search for a family’s geographic roots．
Most tests require collecting ceils by swabbing saliva in the mouth and sending it to the company for testing．All tests require a potential candidate with whom to compareDN
A、
But some observers are skeptical, "There is a kind of false precision being hawked by people claiming they are doing ancestry testing, "says TreyDuster,a New York University sociologist．He notes that each indivridual 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 inherited through men in a father’s line or mitochondrialDNA, which a passed down only from mothers． ThisDN
A、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 svstematically but rather lump together information from different research projects．This means that aDN
A、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．
In the last paragraph，a problem commercial genetic testing faces is______．

A、disorganized data collection
B．overlapping database building
C．excessive sample comparison
D．1ack of patent evaluation
网考网参考答案：A
网考网解析：
[解析] 本题的依据句是第6段的第2句话：Databases used by some companies don’t rely on data collected systematically but rather lump together information from different research projects．从中可知A项为正确答案。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>