Home About Us Laboratory Services Forensic Science Communications Back Issues October 2000 Interpreting DNA Mixtures Based on the NRC-II...

Interpreting DNA Mixtures Based on the NRC-II Recommendation 4.1: Tables (Forensic Science Communications, October 2000)

    U.S. Department of Justice
    Federal Bureau of Investigation
 FBI Seal graphic

Layout graphic: Topline

 

 

 

Graphic link to the Current Issue's table of contents

Graphic link to links to Back Issues

Graphic link to a search engine for all issues

Graphic link to the Journal Description page

Graphic link to the Editorial Board for this issue

Graphic link to the Instructions for Authors

Graphic link to the Handbook of Forensic Services

Graphic link to the FBI Lab Home Page

Graphic link to FBI Publications page (publications listing)

Sidebar graphic

Masthead - Forensic Science Communications
October 2000   Volume 2   Number 4

Interpreting DNA Mixtures Based on the
NRC-II Recommendation 4.1

Table 1
All Possible Genotypes of
Two Unknown Persons and Their Corresponding Probabilities in Computing p2 +cd * abcd ,

Case Genotypes of
2 unknowns
Probabilities
1 aacd 4( pa Ú pa )( pc Ú pd ) + 8( pa Ú pc )( pa Ú pd )
2 bbcd 4( pb Ú pb )( pc Ú pd ) + 8( pb Ú pc )( pb Ú pd )
3 accd 4( pc Ú pc )( pa Ú pd ) + 8( pa Ú pc )( pc Ú pd )
4 acdd 4( pd Ú pd )( pa Ú pd ) + 8( pa Ú pd )( pc Ú pd )
5 bccd 4( pc Ú pc )( pb Ú pd ) + 8( pb Ú pc )( pc Ú pd )
6 bcdd 4( pd Ú pd )( pb Ú pc ) + 8( pb Ú pd )( pc Ú pd )
7 ccdd 2( pc Ú pc )( pd Ú pd ) + 4( pc Ú pd )2
8 cccd 4( pc Ú pc )( pc Ú pd )
9 cddd 4( pd Ú pd )( pc Ú pd )
10 abcd 24( pa Ú pb )( pc Ú pd )

Back to text

Table 2
A Rape Case in Hong Kong

Loci Evidence profile (E) and
frequencies (F)
Victim (V) and
suspect (S) profiles
D3S1358 E = {14, 15, 17, 18} V = {15, 18}
F = {0.033, 0.331, 0.239, 0.056} S = {14, 17}
vWA E = {16, 18} V = {18, 18}
F = {0.155, 0.158} S = {16, 16}
FGA E = {20, 24, 25} V = {20, 24}
F = {0.042, 0.166, 0.106} S = {25, 25}

Back to text

Table 3
Likelihood Ratios for the Case in Hong Kong
With Two Sets of Hypotheses

Hypothesis  q D3S1358 vWA FGA Combined
S1 0 63.4 13.7 18.1 15,721
0.01 63.4 13.5 17.8 15,235
0.03 63.4 13.0 17.2 14,176
S2 0 285.4 119.0 359.2 12,175,485
0.01 285.4 114.0 349.2 11,339,010
0.03 285.4 104.0 331.2 9,810,840

Back to text

Table 4
The Likelihood Ratios for the Simpson Case
With a Three-Allele VNTR Mixed Profile

n* q or 2p m*
0 1 2
2 q = 0 1,623 70 3.06
q = 0.01 1,554 70 3.19
q = 0.03 1,431 70 3.46
2p 158 70 31.06
3 q = 0 21,606 938 41.06
q = 0.01 19,427 881 40.06
q = 0.03 15,914 783 38.06
2p 54 24 11.06
4 q = 0 396,495 17,220 748.06
q = 0.01 338,541 15,352 696.06
q = 0.03 251,636 12,373 609.06
2p 68 30 13.06
*The number of unknowns in Hd and Hp are n and m,
respectively.

Back to text

 

 

FORENSIC SCIENCE COMMUNICATIONS     OCTOBER 2000   VOLUME 2   NUMBER 4

CURRENT ISSUE BACK ISSUES SEARCH
ALL ISSUES
JOURNAL
DESCRIPTION
EDITORS

INSTRUCTIONS
FOR AUTHORS

HANDBOOK OF
FORENSIC SERVICES

LAB HOME

FBI
PUBLICATIONS