Question

Forensic scientists are trying to find an exact dna match to a sample left at the scene of a crime. the sample from the crime scene has both a 900 bp and a 260 bp dna fragment. based on the suspect's profiles below, which one likely committed the crime? suspect i has 900 bp and 540 bp sized dna fragments suspect ii has 840 bp and 260 bp sized dna fragments suspect iii has 900 bp and 260 bp sized dna fragments suspect iv has 730 bp and 380 bp sized dna fragments
a.suspect iii
b.suspect iv
c.suspect ii
d.suspect i submit for grading save and finish later

Answer 1

This question illustrates DNA profiling within forensics. Here, a DNA 'fingerprint' is obtained from a biological sample at a crime scene. This 'fingerprint' can be compared to profiles obtained from DNA of individual suspects or criminal DNA profiles stored on a database. In this case, suspect iii is likely the perpetrator of the crime as his/her DNA profile matches that of the sample left at the crime scene. 

Answer 2

Forensic scientists are trying to find an exact DNA match to a sample left at the scene of a crime. The sample from the crime scene has both a 900 bp and a 260 bp DNA fragment. Based on the suspect's profiles, suspect iii has 900 bp and 260 bp sized DNA fragments suspect.

Further Explanation:

In Forensic testing, a scientist uses the sequence of the DNA to identify an individual for official reasons. But, forensic testing is not used to identify gene mutations related to any disease. This kind of testing helps to identify the criminal. Gene testing is not considered as foolproof as there are many possibilities fault in it based on the procedures used and the situation of the sample. The statistical probability is used to determine the probability of paternity, the relationship of any kind, etc. among two individuals. Usually, 99% or higher percentage of probability is considered conclusive, and thus it gene testing cannot be considered as foolproof.

The table given below will explain the identification method used by the forensic expert. The sample is matched with the suspect three because the DNA fragments are of the exact size.

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Answer Details:

Grade: High School

Subject: Molecular Biology

Topic: Gene testing

Keywords:

Gene testing, foolproof, fault, DNA, forensic testing, newborn testing, pre-implantation testing, prenatal, diagnostic, carrier, chromosome, gene.