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

Answer 1

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:

Gene testing can help in providing information regarding individual chromosomes and genes.

There are different kinds of gene testing are available:

• Diagnostic testing

• Prenatal testing

• Carrier testing

• Pre-implantation testing

• Forensic testing

• Newborn screening

For example, 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 full proof.

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.

 

Answer 2

The answer is ‘suspect iii has 900 bp and 260 bp sized DNA fragments’

Forensic science utilizes particular sequences of DNA that are unique to people and are cut differently by restriction enzymes. These  techniques are referred to as Restriction Fragment Length Polymorphism (RFLP) and the Short Tandem Repeat (STR) Analysis. In this case, there is an exact match on the crime sample and that of the suspect.