Question: This table shows the frequencies for STR lengths in different
U.S. populations. Use this table to…
This table shows the frequencies for STR lengths in different
U.S. populations. Use this table to answer question #1.
| CODIS STR | # of repeats | requency (Caucasion) | Frequency (African American) |
Frequency (Hispanic) |
| D3S1358 | 14 | 0.094 | 0.089 | 0.079 |
| 15 | 0.110 | 0.186 | 0.293 | |
| 16 | 0.200 | 0.248 | 0.286 | |
| 17 | 0.281 | 0.242 | 0.204 | |
| 18 | 0.200 | 0.155 | 0.125 | |
| THO1 | 5 | 0.002 | 0.004 | 0.000 |
| 6 | 0.232 | 0.124 | 0.214 | |
| 7 | 0.190 | 0.421 | 0.096 | |
| 8 | 0.084 | 0.194 | 0.096 | |
| 9 | 0.114 | 0.151 | 0.150 | |
| D18S51 | 10 | 0.008 | 0.006 | 0.004 |
| 11 | 0.017 | 0.002 | 0.011 | |
| 12 | 0.127 | 0.078 | 0.118 | |
| 13 | 0.132 | 0.053 | 0.011 | |
| 14 | 0.137 | 0.072 | 0.139 |
1. A female eyewitness has identified a Hispanic American male
as the man who stole her car. The eyewitness stated that the man
was bleeding profusely from a head wound. Her car was recovered,
and male blood with a 16, 17 combination for D3s1358, a5,9
combination for TH01, and an 11,14 combination for D18ssi was found
on the driver’s seat and steering wheel. Complete the table below.
Does this finding call the eyewitness evidence into question?
Explain your answer.
| Caucasian Male | African American Male | Hispanic Male | |
|
Probability of having a 16, 17 combination for D3S1358 |
|||
|
Probability of having a 5,9 combination for TH01 |
|||
|
having an 11,14 combination for D18S51 |
*The probability of a particular combination of STRs is
found by multiplying frequendes together
2. The U.S. military has just instituted a policy of
taking and freezing a blood sample from each recruit. If necessary
(eg to identify remains), the frozen sample will be subjected to
DNA profiling Do you agree with this? What limitations can be seen
in these procedures?
