Observing The Cell Cycle Biology Worksheet Page 27
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29Investigation 12B
DNA Forensics
12B DNA Forensics
How can DNA be used to solve a “crime?”
You have learned that DNA is the molecule that
Materials
carries the hereditary information. Each
• Red pop beads
individual is genetically unique, except in cases
• White pop beads
of identical twins, and as a result your DNA
• Yellow pop beads
becomes a molecular fingerprint. This
• Green pop beads
molecular fingerprint can be used to identify an
• Orange pop beads
individual with a great degree of certainty and is
• Blue pop beads
used in the field of forensic science. Scientists
• Clear plastic connectors
use DNA left at crime scenes to identify a
• DNA sequences
person who may have been involved in a crime.
In this Investigation, you will use DNA to solve a
• Envelope containing the identity of the DNA
fictional crime.
sequence
A
Doing the Experiment
Today, someone left your teacher an apple with a note, “You are a super teacher!” But between
the time the apple was left and the time your teacher returned to class, a bite has been taken
out of it! Imagine that DNA has been collected from the “crime scene.” A DNA sample has also
been collected from suspects. Your lab group will help solve the case by building a portion of a
DNA molecule from one of the suspects. Then, you will compare your DNA model with others
in the class. Can you solve the mystery?
1. Gather the required materials. Use Table 1 as a key for creating your DNA molecule.
Table 1: DNA model components
Pop bead color
Molecule
Red
Phosphate group
White
Sugar (deoxyribose)
Blue
Cytosine
Orange
Guanine
Yellow
Adenine
Green
Thymine
2. Your teacher will give each group an envelope. The DNA sample number is printed
on the outside. The sequence of bases on one strand is also provided.
.
.
Table 2: DNA sample data
DNA sample number:
Number of bases:
Number of sugar molecules:
Number of phosphate molecules:
1
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