genomics question 1. there are huge numbers of SNPs thats tricky 2. there are 23 or so chromosomes 3. roughly, chromosomes can change by mutation or by recombination 4. recombination is relatively infrequent for adjacent sequences 5. mutation is relatively infrequent
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so A. seems like within a population there will probably a relatively (compared to SNPs especially) small number of consistently-appearing longer segments across generations, especially if some loci are quite a lot more likely to be the site of crossing over than others?
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B. if you can identify these groups you might have a better time using them as features (vs SNPs) especially given eg role of introns in the regulation of expression?
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C. Seems like you could deduce the traits of (successful) founders of populations from these traits a la linguistic archaeology?
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Replying to @eigenrobot
Geneticists use a technique related to the idea you described called Extended Haplotype Homozygosity to estimate the age of certain mutations/adaptations from the length and frequency of these identical segments (they decay over time via mutation&recombination).
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Replying to @Circular_Ruins @eigenrobot
EHH and related techniques can be used to reconstruct the spread of adaptations and their selective strength, and to make inferences about their origin.
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Ok excellent I'm glad the people who do this for a living have figured out their field of study 
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