Biology Student
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This question deals with how likely it is that a lead suspect left blood at a crime scene (hypothetically). Imagine that two bands are observed on a DNA fingerprinting gel and that these match between DNA obtained from the suspect and the crime scene. Consider the bands seen on the gel as different alleles. Imagine that the DNA fragment of band 1 is 500 base pairs long and that this allele has a frequency of 0.05 (5%) in the general population. If band 1 alone matches between suspect and crime scene DNA, what is the probability of a match by chance alone?
A) 0.0025
B) 0.005
C) 0.025
D) 0.05
E) 0.1
Now imagine that the DNA fragment of band 2 is 2,000 base pairs long and that this allele has a frequency of 0.1 (10%) in the general population. If bands 1 (from the previous question) and 2 match between suspect and crime scene DNA, what is the probability of a match by chance alone?
A) 0.0025
B) 0.005
C) 0.025
D) 0.05
E) 0.1
A) 0.0025
B) 0.005
C) 0.025
D) 0.05
E) 0.1
Now imagine that the DNA fragment of band 2 is 2,000 base pairs long and that this allele has a frequency of 0.1 (10%) in the general population. If bands 1 (from the previous question) and 2 match between suspect and crime scene DNA, what is the probability of a match by chance alone?
A) 0.0025
B) 0.005
C) 0.025
D) 0.05
E) 0.1