Answer :
Final answer:
The DNA results of two suspects with different physical appearances would most likely show a 98.8 percent match, as humans share a high degree of DNA similarity. Forensic scientists compare specific variable regions of DNA to determine individual matches.
Explanation:
When forensic scientists receive DNA samples for analysis, they are primarily interested in the genetic sequences rather than the physical appearance of the individuals from whom the DNA was collected. All humans have a high degree of similarity in their DNA, which is why option b. They will have a 98.8 percent match in DNA is the most likely prediction a forensic scientist would make about the DNA results of two suspects who look completely different from one another.
This high percentage of matching DNA is because most of the human genome is made up of shared genetic sequences that code for the basic functions needed in all humans. The variations that determine individual traits, such as height and hair color, represent a very small part of the DNA. Thus, regardless of physical differences, unrelated humans typically share about 99.9% of their DNA. The remaining percentage contains the genetic variations that make each person unique.
In forensic analysis, the focus is on comparing specific regions of the DNA, known as Short Tandem Repeats (STRs), which are highly variable among individuals. It is these unique variations that help forensic scientists to either match a DNA sample to a suspect or exclude them as a source of the DNA.
Since the two suspects in the same crime look completely different, it follows that there could only be a possible 50 percent match in DNA.
What is a DNA analysis?
A DNA test is used to confirm the identity of a person. It can also be used to fish out the culprit in the course of an investigation.
Since the two suspects in the same crime look completely different, it follows that there could only be a possible 50 percent match in DNA.
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