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  3. DNA testing has become something our society relies on very heavily for identification purposes. Everyone has different DNA so i

DNA testing has become something our society relies on very heavily for identification purposes. Everyone has different DNA so i

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问题     DNA testing has become something our society relies on very heavily for identification purposes. Everyone has different DNA so it is a unique way to identify an individual. It is the equivalent of a signature only in a genetic form that can’t be altered or hidden. One of the most common uses of DNA testing is to track down criminals who have left hair, skin, or semen at the scene of a crime.
    A use for DNA testing that is less familiar to most individuals is for tracking down a person’s heritage. It can be hard to determine a person’s heritage without the help of DNA testing. Each person is classified into one of four main groups when it comes to ancestry. Those groups arc East Asian, Native American, African, or European.
    Many people have some identifying features or skin colors that help to identify their particular line of ancestry. The trouble is that many people have parents from two different ancestry lines. This makes the diversification very hard to track as you start looking back on generations of mixed ancestry. With ancestry DNA it is possible to determine the dominant one for that individual.
    The testing involved in the ancestry DNA process is done with the technology available today. Ancestry DNA testing involves the process of Single Nucleotide Polymorphism so that the dominant ethnic group can be identified. The Single Nucleotide Polymorphism also tells the percentage of the different ancestry groups that make up the individual’s DNA.
    While you may wonder why ancestry is so important to some people, the reality is that it does matter. It is interesting to know where your heritage lies and for some people not knowing gives them a void they really want to have filled. This is more important to them than simply fitting into society because of their race or color.
    There is plenty of debate surrounding the concept of ancestry DNA. Many experts claim it is not a reliable way to determine one’s heritage. They also believe it causes issues with cultural beliefs rather than instilling a sense of their role in society. Others find these claims to be completely ridiculous and place plenty of merit in ancestry DNA test results.
    There are many good ancestry DNA test locations in the world that do offer individuals the opportunity to find out where their true heritage lies. Meanwhile an independent validation method still has to be adopted before the scientific field is going to accept it.
According to the text, DNA testing______.
选项 A、is a highly accurate, reliable and confidential way
B、can differentiate a person from all the other people
C、is an indispensible tool for verifying one’s signature
D、helps to distinguish a criminal’s hair, skin, or semen
答案B
解析 根据第一段第二句，每个人的DNA都不同，因此可以用DNA测试来验证一个人的身份。所以，B应为答案。
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