Structure

1
Structure

• Infer population structure
• Assign individuals to populations
• Identify migrants
• Identify admixed individuals

2
How it works

• Populations designated by Structure are in H-W
  equilibrium
• Real population structure leads to LD and
  departures from H-W
• Can handle linked markers with linkage map
• Uses MCMC
• Starts from a random configuration
• Steps through parameter space to estimate the
  probability that predicted K actual K

3
Ancestry Models

• No admixture
• Use for dominant data
• Admixture
• Use for most codominant data
• An individual may have ancestors in more than one
  population
• Linkage
• Use if loci are linked and a linkage map is
  available
• Likely to occur in recently mixed populations
• Prior information

4
(No Transcript)
5
(No Transcript)
6
Determining populations
Codominant data set Pop1MEN Pop2 PLU Pop3
SANB