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  3. DNA fingerprinting is used to determine where particular genetic material came from, that is what person or group of people’ s m

DNA fingerprinting is used to determine where particular genetic material came from, that is what person or group of people’ s m

admin2015-01-31  68
问题     DNA fingerprinting is used to determine where particular genetic material came from, that is what person or group of people’ s material is mostly likely to come from. Only 1% of our DNA differs from other individuals since 99% of human DNA is identical. That 1% though can allow scientists to differentiate its origin.
    DNA fingerprinting is most commonly used to determine our heredity. When used alongside more traditional sociological methodologies, DNA fingerprinting can be used to find out exactly where we came from, in some cases, which tribe. However, DNA fingerprinting cannot discriminate between identical twins.
    Most people are aware of the use of DNA fingerprinting in forensic medicine. Samples gathered at a crime scene can be compared with the DNA of a suspect to prove his or her presence at or involvement with the crime. The problem is that DNA bases only hold the DNA of people who have already been convicted of a crime. They do not contain the DNA of whole populations so it impossible to use this technique to track down suspects that are nor present in the database. However this might change. If governments replace photograph ID cards to that of DNA fingerprint ID cards, then it will be far easier to track down anyone within a nation’ s population.
    DNA fingerprinting can also help us to predict our future health. It is often used to track down the genetic basis of inherited diseases. If there is a particular, recurring pattern in different patients, scientists can narrow down which gene or genes might be involved. It can also be used to screen parents and fetuses for the presence of inherited abnormalities, such as Huntington’s disease or muscular dystrophy, so appropriate advice can be given and precautions taken as needed.
    The use of DNA fingerprinting and genetic screening is fast in changing society and the way we treat illnesses, track down criminals and soon, identify the public. It is a science that has dramatically changed society and continues to make great contributions to health and science in all fields.
Which one of the following is TRUE according to the passage?
选项 A、Only two percent of human DNA attributes to the difference.
B、Identical twins are unable to be distinguished by DNA fingerprinting.
C、Only by applying method of DNA fingerprinting can we identify where people come from.
D、DNA fingerprinting is simply used to identify our heredity.
答案B
解析 细节题。根据首段第二句，意为人类DNA的99％是一样的，只有1％有个体差异。可知选项A有误。根据第二段第二句，“When used alongside moretraditional sociological methodologies…”，意为当DNA指纹识别法和更传统的社会学方法论相结合时。才能确切查明我们的来历。由此可知选项C错误。原文第二段第一句，DNA指纹识别法被常常用于遗传的鉴定。并不是仅仅用于遗传鉴定，所以选项D错误。DNA指纹识别法不能鉴别双胞胎，与原文第二段最后一句意思相符。因此，B为正确答案。
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