- 01 Introduction
- 02 Biology of DNA
- 03 Practical Issues Specific to DNA Evidence
- 04 Introduction to the Forensic DNA Laboratory
- 05 Assuring Quality in DNA Testing
- 06 Understanding a Forensic DNA Lab Report
- 07 Statistics and Population Genetics
- 08 Mitochondrial DNA & Y-STR Analysis
- 09 Forensic DNA Databases
- 10 Collection of DNA Evidence from Suspects and Arrestees
- 11 Pretrial DNA Evidence Issues
- 12 Victim Issues
- 13 Trial Presentation
- 14 Postconviction DNA Cases
- 15 Emerging Trends
Principles of Forensic DNA
for Officers of the Court
for Officers of the Court
Module 2 :: Biology of DNA
Topic 1 :: Biological Terminology
Genotyping
There are three possible genotypes for any two alleles. For example, assume you have alleles 'B' and 'b' at a locus; the possible genotypes are BB, bb, and Bb.
The genotypes BB and bb are the homozygous genotypes, and Bb is the heterozygous genotype.
Click here to view an animation on homozygous and heterozygous genotypes.
